obturatorn.

Brit.

/ˈɒbtjᵿreɪtə/,

/ˈɒbtʃᵿreɪtə/, U.S.

/ˈɑbt(j)əˌreɪdər/

Forms: 1600s– obturator, 1800s– obdurator (irregular).

Origin: A borrowing from Latin. Etymon: Latin obturator.

Etymology: < post-classical Latin obturator (1599 or earlier, and also in obturator internus obturator internus n., obturator externus obturator externus n.; obturator occurs c1440 in a British source, denoting a person who blocks up (a ditch or channel)) < classical Latin obtūrāt- , past participial stem of obtūrāre obturate v. + -or -or suffix. Compare Middle French, French obturateur surgical plate (c1550 in Paré; compare sense 2a), obturator muscle (1765; compare sense 1a), camera shutter (1868; compare sense 3a), firearms device (1874; compare sense 3b).With obturator muscle (see sense 1a) compare Middle French muscle obturateur (c1550 in Paré); with obturator ligament (see sense 1b) compare French ligament obturateur (1765); with obturator artery (see Compounds) compare French artère obturatrice (1765).

1. Anatomy and Zoology.

a. Either of the two muscles that cover the large opening (obturator foramen) in the hip bone; the obturator externus or obturator internus muscle (see obturator externus n., obturator internus n.). Frequently with distinguishing word. Cf. obturator muscle n. at Compounds.

ΘΚΠ

the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of pelvis or hips

iliacus1615

psoa1615

psoas1615

square muscle1615

obturator1618

obturator externus1618

obturator internus1618

gluteus1681

pectineus1688

pyriformis1688

quadrigeminal1688

obturatory1719

obturator muscle1726

ischiocavernosus1733

iliac muscle1741

kicking-muscle1866

white line1874

pelvimyon1888

parvipsoas1890

1618 H. Crooke Μικροκοσμογραϕια (new ed.) x. vi. 744 The substance of the Buttocks, there are also too-ward muscles and 6. froward, 2. obturatores, and 4. twinnes called quadrigemini.

1728 E. Chambers Cycl. Obturator, in Anatomy, a Name given to two Muscles of the Thigh..covering up the Foramen or Aperture between the Os Pubis, and the Hip-Bone.

1793 J. Bell Anat. Bones, Muscles, & Joints ii. viii. 345 The ligament and the muscles shutting up the foramen thyroideum are named obturators.

1850 Topographical Anat. (Amer. Inst. Homoeopathy) 48 Muscles... Obturators, external and internal.

1946 Amer. Midland Naturalist 35 642 A deep, elongate fossa is formed for the large muscles present here–the adductors, the obturators, the crural flexors and the ischio-femoralis.

1998 Jrnl. Small Animal Pract. 39 240 The hernias were repaired using modifications of the standard or internal obturator flap herniorrhaphies.

b. The obturator membrane. rare.

ΘΚΠ

the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of

obturator ligament1753

obturator1793

obturator membrane1840

1793 J. Bell Anat. Bones, Muscles, & Joints ii. viii. 345 The ligament and the muscles shutting up the foramen thyroideum are named obturators.

1971 Lancet 12 June 1234/2 In fact the foramen used to be called the thyroid foramen, for its shield-like shape, and the original obturator was the membrane that filled it.

a. Surgery and Dentistry. A prosthetic device used to close an abnormal opening, esp. in the palate.

ΘΚΠ

the world > health and disease > healing > medical appliances or equipment > other medical equipment > [noun] > closures or plugs

rhinobyon1837

obturator1843

rhineurynter1871

1824 J. Snell (title) Observations on the history, use and construction of obturateurs: or, what have hitherto been called in the country, artificial palates.]

1843 Amer. Jrnl. Dental Sci. 3 233 By artificial obturators are denoted contrivances for obstructing the passage of air, fluids or solid food, through the palatal arch.

1857 Trans. Odontol. Soc. 1 76 A description of the obturator I am in the habit of employing.

1876 Trans. Clin. Soc. 9 125 Mr. Sewill..made for me an obturator according to the following plan:—A small plate was made to accurately fit the roof of the mouth [etc.]... Immediately after the obturator was applied, the patient could articulate the letters s and z to perfection—sounds which she was quite unable to make before.

1902 Dental Cosmos 44 573 Dr. Ottolengui says: ‘An obturator is an instrument designed to merely fill a gap or close an opening in the palate’.

1961 J. N. Anderson Appl. Dental Materials (ed. 2) xxii. 225 Soft rubber-like materials are used for artificial replacements such as..cleft palate obturators.

1987 ‘A. Burgess’ Little Wilson & Big God (U.K. ed.) iv. 272 There was also a man with a cleft palate who had been fitted with an obturator.

b. Botany. Tissue that closes or plugs an opening in a plant part; spec. an outgrowth of specialized tissue associated with the micropyle of the ovule, serving as a guide for the pollen tube.

ΚΠ

1857 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Obturator,..applied by L. C. Richard to a body of variable form and colour which accompanies the pollinic masses of the Orchideæ and the Asclepias.

1900 B. D. Jackson Gloss. Bot. Terms 173/1 Obturator,..(3) a process of the wall of the ovary descending on the micropyle, in Plumbago.

1906 Bot. Gaz. 42 77 The obturator, a tissue which serves for the conduction and nutrition of the pollen tube, is always present.

1984 Amer. Jrnl. Bot. 71 682 Cells of the ovarian transmitting tissue, viz., the obturator, have a distinctive wall anatomy on their secretory face.

1998 Internat. Jrnl. Plant Sci. 159 569/2 The formation of this ponticulus is independent of pollination and fulfills a role very much like an obturator.

c. Chiefly Medicine and Surgery. A device that occludes the lumen of a vessel or instrument; esp. a wire or rod used during the insertion of a tubular instrument; a stylet, a director.

ΘΚΠ

the world > health and disease > healing > medical appliances or equipment > surgical instruments > [noun] > guiding or directing instruments

director1667

directory1693

staff1699

obturator1862

1862 Sci. Amer. 31 May 348/1 Vertical retorts, each having a suitable lid and a movable bottom or obturator.

1900 Buck's Ref. Handbk. Med. Sci. (rev. ed.) I. 779/1 Each instrument has its own obturator, which is to be used only for rounding out the end of the speculum during introduction.

1944 Science 2 June 456/1 (title) A cannula with obturator for use in arterial pressure measurements on small animals.

1949 Blakiston's New Gould Med. Dict. 686/1 Obturators may be bayonet-pointed for piercing tissues, or obliquely faced at the end for fitting, exactly, large aspirating needles. The term is also applied to the metal carriers within urethroscopes and cytoscopes, etc.

1975 Nature 3 Apr. 439/2 Each rat was implanted bilaterally with stainless steel guide cannulae, fitted with an obturator.

1997 Brain Res. 772 29 In the second group, the nigral tissue was punctured with an extended obturator which was then replaced by a microdialysis probe.

†a. Photography. The shutter of a camera. Obsolete.

ΘΚΠ

society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > shutter

Venetian shutter1844

obturator1853

shutter1862

roller blind1882

leaf shutter1892

time shutter1893

between-lens shutter1909

barn door1942

1853 Househ. Words 19 Mar. 58/1 A blackstopper (the obturator) was clapped over the glass in front.

1887 Brit. Jrnl. Photogr. 24 June 399/1 A new obturator or instantaneous shutter.

1890 Harper's Mag. May 832/1 This tube, held before his eyes and turned sharply with the fingers, formed a shutter or obturator on the same principle as the shutter of a photographic camera.

b. Firearms and Gunnery. A cap, pad, or other sealing device for preventing the escape of gas through the breech of a gun in firing. Cf. gas check n. at gas n.¹ and adj. Compounds 3.

ΘΚΠ

society > armed hostility > military equipment > weapon > device for discharging missiles > firearm > parts and fittings of firearms > [noun] > breech > other parts of breech

base1626

bridge pin1686

breech-pin1727

finger-piece1767

tang1805

hut1848

breech-lever1862

breech-screw1862

plunger1866

shoe1866

breech-block1881

breech-plug1881

console1882

crossbar1884

obturator1891

tray1909

1891 Cent. Dict. (at cited word) A Broadwell ring, a Freire obturator, a De Bange obturator, or an Armstrong gas-check.

1894 Times 10 Oct. 5/1 The Chinese received the severest punishment while..struggling..to replace obturator rings.

1910 Encycl. Brit. I. 873/1 This case is inserted into the gun, and when fired slightly expands and tightly fits the chamber of the gun, thus acting as an obturator and preventing any escape of gas from the breech.

1932 Philos. Trans. (Royal Soc.) A. 230 40 The breech is closed by a screwed block, and gas sealing is effected in the same way as in a gun, by a slow cone pad obturator.

1976 Shooting Times & Country Mag. 18–24 Nov. 28/1 This plastic cup proved the best obturator yet.

Compounds

obturator artery n. Anatomy and Zoology a branch of the internal iliac artery, supplying the obturator externus and muscles of the inner thigh.

ΚΠ

1797 J. Bell Anat. Human Body II. 450 The obturator artery is so named from its passing through the thyroid hole.

1918 Proc. National Acad. Sci. U.S.A. 4 207 In the dead pocket between the aorta and the origin of the circumflex iliac and common trunk of the epigastric and obturator arteries the blood pressure must have been almost nil.

2002 Surg. & Radiol. Anat. 24 81 The branches of the anterior and posterior divisions of the obturator artery supply the superior part of the surroundings of the obturator foramen and the antero-inferior and postero-inferior parts of the acetabulum.

obturator canal n. Anatomy and Zoology an opening between the upper border of the obturator membrane and the rim of the obturator foramen, forming a passage for the obturator artery, vein, and nerve.

ΚΠ

1860 H. Gray Anat. (ed. 2) 754 In front, it..arches beneath the obturator vessels, completing the orifice of the obturator canal.

1913 Cunningham's Text-bk. Anat. (ed. 4) 338 At the highest point of the foramen it [sc. the obturator membrane] is incomplete and forms a U-shaped border, between which and the bony circumference of the foramen the obturator canal is found.

2003 Jrnl. Orthopaedic Sci. 8 323 The intrapelvic entry portal of the obturator canal was located more caudodorsal to the base of the superior pubic ramus in females than in males.

obturator foramen n. Anatomy and Zoology a large opening in the hip bone, between the ischium and pubis.

ΘΚΠ

the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen

stopper1683

obturator foramen1824

thyroid foramen1890

1824 Lancet 11 Jan. 45/2 It [sc. the obturator artery] passes out through the obturator foramen.

1892 Amer. Naturalist 26 126 The general shape of the pelvis is similar, especially the horizontal position, with minute obturator foramen.

1939 T. L. Green Pract. Animal Biol. i. 197 The pubis is a thin rod projecting backwards below the ischium (from which it is partially separated by the obturator foramen) and forwards beyond the acetabulum.

1987 D. J. Weatherall et al. Oxf. Textbk. Med. (ed. 2) II. xxi. 123/2 The nerve..enters the thigh through the obturator foramen.

† obturator ligament n. Anatomy and Zoology Obsolete = obturator membrane n.

ΘΚΠ

the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of

obturator ligament1753

obturator1793

obturator membrane1840

1753 Chambers's Cycl. Suppl. Obturator ligament, is one of the proper ligaments of the ossa innominata, and fills up the great foramen ovale.

1842 E. Wilson Anatomist's Vade Mecum (ed. 2) 110 The Obturator ligament or Membrane is a tendino-fibrous Membrane stretched across the obturator foramen.

obturator membrane n. Anatomy and Zoology a sheet of fibrous tissue that occupies most of the obturator foramen.

ΘΚΠ

the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of

obturator ligament1753

obturator1793

obturator membrane1840

1840 W. J. E. Wilson Anatomist's Vade Mecum ii. 110 The Obturator ligament or membrane is..a tendino-fibrous membrane stretched across the obturator foramen.

1945 Amer. Midland Naturalist 33 335 Obturator externus—Arises on lateral margins of obturator foramen and from obturator membrane.

1998 Amer. Jrnl. Obstetr. & Gynecol. 179 1436 Paravaginal defects were repaired by placing sutures through the arcus tendineus and underlying obturator fascia, obturator membrane, and ischial periosteum.

obturator muscle n. Anatomy and Zoology the obturator externus or obturator internus.

ΘΚΠ

the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of pelvis or hips

iliacus1615

psoa1615

psoas1615

square muscle1615

obturator1618

obturator externus1618

obturator internus1618

gluteus1681

pectineus1688

pyriformis1688

quadrigeminal1688

obturatory1719

obturator muscle1726

ischiocavernosus1733

iliac muscle1741

kicking-muscle1866

white line1874

pelvimyon1888

parvipsoas1890

the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of leg

gracilis1615

quadriceps1618

peroneus1638

bicepsa1641

gastrocnemius1676

soleus1676

popliteus1688

sartorius1704

peroneus brevis1707

obturator muscle1726

tailor's muscle1728

subcrureus1793

thigh-muscle1899

quad1958

1726 A. Monro Anat. Humane Bones 229 The great design of this Foramen..would appear to be for allowing a strong enough Origin to, and sufficient space for lodging the Bellies of these obturator muscles.

1858 H. Gray Anat. 288 When the femur is fixed, the Pyriformis and Obturator muscles serve to draw the pelvis forwards if it has been inclined backwards.

1981 Proc. Royal Soc. B. 214 13 Those [axons] destined for the adductor and obturator muscles begin to segregate within spinal nerves 1, 2, and 3.

obturator nerve n. Anatomy and Zoology a branch of the lumbar plexus that supplies the muscles and skin of the inner thigh.

ΘΚΠ

the world > life > the body > nervous system > nerve > specific nerves > [noun] > nerves in trunk

cauda1696

obturator nerve1732

phrenic1737

sciatic1741

solar ganglion1741

pudendal1752

solar plexus?1768

splanchnic1840

mare's tail1890

stellate ganglion1918

1732 A. Monro Anat. Treat. Nerves 30 This Nerve is commonly called the Obturator, or posterior crural nerve.

1803 C. Bell Anat. Human Body III. 196 The second nerve is the obturator nerve, so called because it passes out from the pelvis by the thyroid hole.

1945 Q. Rev. Biol. 20 322/2 A sizable bundle of fibers of the sciatic nerve was crossed along with the obturator nerve into the femoral muscles.

1987 D. J. Weatherall et al. Oxf. Textbk. Med. (ed. 2) I. xi. 39/1 Pain and paraesthesias in the upper medial part of the thigh..may follow a difficult labour and are caused by trauma to the obturator nerve.

obturator vein n. Anatomy and Zoology a tributary of the internal iliac vein that accompanies the obturator artery.

ΚΠ

1840 T. Castle Blundell's Princ. & Pract. Obstetr. i. i. 4 The obturator ligament is the ligamentous sheet which closes the obturator foramen, having an aperture at the upper and back part, through which the obturator artery, vein, and nerve are transmitted.

1893 H. Morris Human Anat. 677 The obturator vein..opens into the front of the internal iliac vein a little below the gluteal.

1979 Acta Anatomica 105 61 Occasionally, an inferior vesical vein ending in the obturator vein accompanied an inferior vesical artery initiating from the obturator artery.

2002 Jrnl. Amer. Assoc. Gynecol. Laparoscopists 9 49 Two cases were converted to laparotomy due to incomplete hemostasis of the uterine artery and obturator vein.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online June 2022).

单词	obturator
释义	obturatorn. Brit. /ˈɒbtjᵿreɪtə/, /ˈɒbtʃᵿreɪtə/, U.S. /ˈɑbt(j)əˌreɪdər/ Forms: 1600s– obturator, 1800s– obdurator (irregular). Origin: A borrowing from Latin. Etymon: Latin obturator. Etymology: < post-classical Latin obturator (1599 or earlier, and also in obturator internus obturator internus n., obturator externus obturator externus n.; obturator occurs c1440 in a British source, denoting a person who blocks up (a ditch or channel)) < classical Latin obtūrāt- , past participial stem of obtūrāre obturate v. + -or -or suffix. Compare Middle French, French obturateur surgical plate (c1550 in Paré; compare sense 2a), obturator muscle (1765; compare sense 1a), camera shutter (1868; compare sense 3a), firearms device (1874; compare sense 3b).With obturator muscle (see sense 1a) compare Middle French muscle obturateur (c1550 in Paré); with obturator ligament (see sense 1b) compare French ligament obturateur (1765); with obturator artery (see Compounds) compare French artère obturatrice (1765). 1. Anatomy and Zoology. a. Either of the two muscles that cover the large opening (obturator foramen) in the hip bone; the obturator externus or obturator internus muscle (see obturator externus n., obturator internus n.). Frequently with distinguishing word. Cf. obturator muscle n. at Compounds. ΘΚΠ the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of pelvis or hips iliacus1615 psoa1615 psoas1615 square muscle1615 obturator1618 obturator externus1618 obturator internus1618 gluteus1681 pectineus1688 pyriformis1688 quadrigeminal1688 obturatory1719 obturator muscle1726 ischiocavernosus1733 iliac muscle1741 kicking-muscle1866 white line1874 pelvimyon1888 parvipsoas1890 1618 H. Crooke Μικροκοσμογραϕια (new ed.) x. vi. 744 The substance of the Buttocks, there are also too-ward muscles and 6. froward, 2. obturatores, and 4. twinnes called quadrigemini. 1728 E. Chambers Cycl. Obturator, in Anatomy, a Name given to two Muscles of the Thigh..covering up the Foramen or Aperture between the Os Pubis, and the Hip-Bone. 1793 J. Bell Anat. Bones, Muscles, & Joints ii. viii. 345 The ligament and the muscles shutting up the foramen thyroideum are named obturators. 1850 Topographical Anat. (Amer. Inst. Homoeopathy) 48 Muscles... Obturators, external and internal. 1946 Amer. Midland Naturalist 35 642 A deep, elongate fossa is formed for the large muscles present here–the adductors, the obturators, the crural flexors and the ischio-femoralis. 1998 Jrnl. Small Animal Pract. 39 240 The hernias were repaired using modifications of the standard or internal obturator flap herniorrhaphies. b. The obturator membrane. rare. ΘΚΠ the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of obturator ligament1753 obturator1793 obturator membrane1840 1793 J. Bell Anat. Bones, Muscles, & Joints ii. viii. 345 The ligament and the muscles shutting up the foramen thyroideum are named obturators. 1971 Lancet 12 June 1234/2 In fact the foramen used to be called the thyroid foramen, for its shield-like shape, and the original obturator was the membrane that filled it. 2. a. Surgery and Dentistry. A prosthetic device used to close an abnormal opening, esp. in the palate. ΘΚΠ the world > health and disease > healing > medical appliances or equipment > other medical equipment > [noun] > closures or plugs rhinobyon1837 obturator1843 rhineurynter1871 1824 J. Snell (title) Observations on the history, use and construction of obturateurs: or, what have hitherto been called in the country, artificial palates.] 1843 Amer. Jrnl. Dental Sci. 3 233 By artificial obturators are denoted contrivances for obstructing the passage of air, fluids or solid food, through the palatal arch. 1857 Trans. Odontol. Soc. 1 76 A description of the obturator I am in the habit of employing. 1876 Trans. Clin. Soc. 9 125 Mr. Sewill..made for me an obturator according to the following plan:—A small plate was made to accurately fit the roof of the mouth [etc.]... Immediately after the obturator was applied, the patient could articulate the letters s and z to perfection—sounds which she was quite unable to make before. 1902 Dental Cosmos 44 573 Dr. Ottolengui says: ‘An obturator is an instrument designed to merely fill a gap or close an opening in the palate’. 1961 J. N. Anderson Appl. Dental Materials (ed. 2) xxii. 225 Soft rubber-like materials are used for artificial replacements such as..cleft palate obturators. 1987 ‘A. Burgess’ Little Wilson & Big God (U.K. ed.) iv. 272 There was also a man with a cleft palate who had been fitted with an obturator. b. Botany. Tissue that closes or plugs an opening in a plant part; spec. an outgrowth of specialized tissue associated with the micropyle of the ovule, serving as a guide for the pollen tube. ΚΠ 1857 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Obturator,..applied by L. C. Richard to a body of variable form and colour which accompanies the pollinic masses of the Orchideæ and the Asclepias. 1900 B. D. Jackson Gloss. Bot. Terms 173/1 Obturator,..(3) a process of the wall of the ovary descending on the micropyle, in Plumbago. 1906 Bot. Gaz. 42 77 The obturator, a tissue which serves for the conduction and nutrition of the pollen tube, is always present. 1984 Amer. Jrnl. Bot. 71 682 Cells of the ovarian transmitting tissue, viz., the obturator, have a distinctive wall anatomy on their secretory face. 1998 Internat. Jrnl. Plant Sci. 159 569/2 The formation of this ponticulus is independent of pollination and fulfills a role very much like an obturator. c. Chiefly Medicine and Surgery. A device that occludes the lumen of a vessel or instrument; esp. a wire or rod used during the insertion of a tubular instrument; a stylet, a director. ΘΚΠ the world > health and disease > healing > medical appliances or equipment > surgical instruments > [noun] > guiding or directing instruments director1667 directory1693 staff1699 obturator1862 1862 Sci. Amer. 31 May 348/1 Vertical retorts, each having a suitable lid and a movable bottom or obturator. 1900 Buck's Ref. Handbk. Med. Sci. (rev. ed.) I. 779/1 Each instrument has its own obturator, which is to be used only for rounding out the end of the speculum during introduction. 1944 Science 2 June 456/1 (title) A cannula with obturator for use in arterial pressure measurements on small animals. 1949 Blakiston's New Gould Med. Dict. 686/1 Obturators may be bayonet-pointed for piercing tissues, or obliquely faced at the end for fitting, exactly, large aspirating needles. The term is also applied to the metal carriers within urethroscopes and cytoscopes, etc. 1975 Nature 3 Apr. 439/2 Each rat was implanted bilaterally with stainless steel guide cannulae, fitted with an obturator. 1997 Brain Res. 772 29 In the second group, the nigral tissue was punctured with an extended obturator which was then replaced by a microdialysis probe. 3. †a. Photography. The shutter of a camera. Obsolete. ΘΚΠ society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > shutter Venetian shutter1844 obturator1853 shutter1862 roller blind1882 leaf shutter1892 time shutter1893 between-lens shutter1909 barn door1942 1853 Househ. Words 19 Mar. 58/1 A blackstopper (the obturator) was clapped over the glass in front. 1887 Brit. Jrnl. Photogr. 24 June 399/1 A new obturator or instantaneous shutter. 1890 Harper's Mag. May 832/1 This tube, held before his eyes and turned sharply with the fingers, formed a shutter or obturator on the same principle as the shutter of a photographic camera. b. Firearms and Gunnery. A cap, pad, or other sealing device for preventing the escape of gas through the breech of a gun in firing. Cf. gas check n. at gas n.¹ and adj. Compounds 3. ΘΚΠ society > armed hostility > military equipment > weapon > device for discharging missiles > firearm > parts and fittings of firearms > [noun] > breech > other parts of breech base1626 bridge pin1686 breech-pin1727 finger-piece1767 tang1805 hut1848 breech-lever1862 breech-screw1862 plunger1866 shoe1866 breech-block1881 breech-plug1881 console1882 crossbar1884 obturator1891 tray1909 1891 Cent. Dict. (at cited word) A Broadwell ring, a Freire obturator, a De Bange obturator, or an Armstrong gas-check. 1894 Times 10 Oct. 5/1 The Chinese received the severest punishment while..struggling..to replace obturator rings. 1910 Encycl. Brit. I. 873/1 This case is inserted into the gun, and when fired slightly expands and tightly fits the chamber of the gun, thus acting as an obturator and preventing any escape of gas from the breech. 1932 Philos. Trans. (Royal Soc.) A. 230 40 The breech is closed by a screwed block, and gas sealing is effected in the same way as in a gun, by a slow cone pad obturator. 1976 Shooting Times & Country Mag. 18–24 Nov. 28/1 This plastic cup proved the best obturator yet. Compounds obturator artery n. Anatomy and Zoology a branch of the internal iliac artery, supplying the obturator externus and muscles of the inner thigh. ΚΠ 1797 J. Bell Anat. Human Body II. 450 The obturator artery is so named from its passing through the thyroid hole. 1918 Proc. National Acad. Sci. U.S.A. 4 207 In the dead pocket between the aorta and the origin of the circumflex iliac and common trunk of the epigastric and obturator arteries the blood pressure must have been almost nil. 2002 Surg. & Radiol. Anat. 24 81 The branches of the anterior and posterior divisions of the obturator artery supply the superior part of the surroundings of the obturator foramen and the antero-inferior and postero-inferior parts of the acetabulum. obturator canal n. Anatomy and Zoology an opening between the upper border of the obturator membrane and the rim of the obturator foramen, forming a passage for the obturator artery, vein, and nerve. ΚΠ 1860 H. Gray Anat. (ed. 2) 754 In front, it..arches beneath the obturator vessels, completing the orifice of the obturator canal. 1913 Cunningham's Text-bk. Anat. (ed. 4) 338 At the highest point of the foramen it [sc. the obturator membrane] is incomplete and forms a U-shaped border, between which and the bony circumference of the foramen the obturator canal is found. 2003 Jrnl. Orthopaedic Sci. 8 323 The intrapelvic entry portal of the obturator canal was located more caudodorsal to the base of the superior pubic ramus in females than in males. obturator foramen n. Anatomy and Zoology a large opening in the hip bone, between the ischium and pubis. ΘΚΠ the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen stopper1683 obturator foramen1824 thyroid foramen1890 1824 Lancet 11 Jan. 45/2 It [sc. the obturator artery] passes out through the obturator foramen. 1892 Amer. Naturalist 26 126 The general shape of the pelvis is similar, especially the horizontal position, with minute obturator foramen. 1939 T. L. Green Pract. Animal Biol. i. 197 The pubis is a thin rod projecting backwards below the ischium (from which it is partially separated by the obturator foramen) and forwards beyond the acetabulum. 1987 D. J. Weatherall et al. Oxf. Textbk. Med. (ed. 2) II. xxi. 123/2 The nerve..enters the thigh through the obturator foramen. † obturator ligament n. Anatomy and Zoology Obsolete = obturator membrane n. ΘΚΠ the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of obturator ligament1753 obturator1793 obturator membrane1840 1753 Chambers's Cycl. Suppl. Obturator ligament, is one of the proper ligaments of the ossa innominata, and fills up the great foramen ovale. 1842 E. Wilson Anatomist's Vade Mecum (ed. 2) 110 The Obturator ligament or Membrane is a tendino-fibrous Membrane stretched across the obturator foramen. obturator membrane n. Anatomy and Zoology a sheet of fibrous tissue that occupies most of the obturator foramen. ΘΚΠ the world > life > the body > structural parts > bone or bones > bony support for limbs > pelvis > [noun] > hip bone > innominate bone > obturator foramen > membrane of obturator ligament1753 obturator1793 obturator membrane1840 1840 W. J. E. Wilson Anatomist's Vade Mecum ii. 110 The Obturator ligament or membrane is..a tendino-fibrous membrane stretched across the obturator foramen. 1945 Amer. Midland Naturalist 33 335 Obturator externus—Arises on lateral margins of obturator foramen and from obturator membrane. 1998 Amer. Jrnl. Obstetr. & Gynecol. 179 1436 Paravaginal defects were repaired by placing sutures through the arcus tendineus and underlying obturator fascia, obturator membrane, and ischial periosteum. obturator muscle n. Anatomy and Zoology the obturator externus or obturator internus. ΘΚΠ the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of pelvis or hips iliacus1615 psoa1615 psoas1615 square muscle1615 obturator1618 obturator externus1618 obturator internus1618 gluteus1681 pectineus1688 pyriformis1688 quadrigeminal1688 obturatory1719 obturator muscle1726 ischiocavernosus1733 iliac muscle1741 kicking-muscle1866 white line1874 pelvimyon1888 parvipsoas1890 the world > life > the body > structural parts > muscle > muscles of specific parts > [noun] > muscles of leg gracilis1615 quadriceps1618 peroneus1638 bicepsa1641 gastrocnemius1676 soleus1676 popliteus1688 sartorius1704 peroneus brevis1707 obturator muscle1726 tailor's muscle1728 subcrureus1793 thigh-muscle1899 quad1958 1726 A. Monro Anat. Humane Bones 229 The great design of this Foramen..would appear to be for allowing a strong enough Origin to, and sufficient space for lodging the Bellies of these obturator muscles. 1858 H. Gray Anat. 288 When the femur is fixed, the Pyriformis and Obturator muscles serve to draw the pelvis forwards if it has been inclined backwards. 1981 Proc. Royal Soc. B. 214 13 Those [axons] destined for the adductor and obturator muscles begin to segregate within spinal nerves 1, 2, and 3. obturator nerve n. Anatomy and Zoology a branch of the lumbar plexus that supplies the muscles and skin of the inner thigh. ΘΚΠ the world > life > the body > nervous system > nerve > specific nerves > [noun] > nerves in trunk cauda1696 obturator nerve1732 phrenic1737 sciatic1741 solar ganglion1741 pudendal1752 solar plexus?1768 splanchnic1840 mare's tail1890 stellate ganglion1918 1732 A. Monro Anat. Treat. Nerves 30 This Nerve is commonly called the Obturator, or posterior crural nerve. 1803 C. Bell Anat. Human Body III. 196 The second nerve is the obturator nerve, so called because it passes out from the pelvis by the thyroid hole. 1945 Q. Rev. Biol. 20 322/2 A sizable bundle of fibers of the sciatic nerve was crossed along with the obturator nerve into the femoral muscles. 1987 D. J. Weatherall et al. Oxf. Textbk. Med. (ed. 2) I. xi. 39/1 Pain and paraesthesias in the upper medial part of the thigh..may follow a difficult labour and are caused by trauma to the obturator nerve. obturator vein n. Anatomy and Zoology a tributary of the internal iliac vein that accompanies the obturator artery. ΚΠ 1840 T. Castle Blundell's Princ. & Pract. Obstetr. i. i. 4 The obturator ligament is the ligamentous sheet which closes the obturator foramen, having an aperture at the upper and back part, through which the obturator artery, vein, and nerve are transmitted. 1893 H. Morris Human Anat. 677 The obturator vein..opens into the front of the internal iliac vein a little below the gluteal. 1979 Acta Anatomica 105 61 Occasionally, an inferior vesical vein ending in the obturator vein accompanied an inferior vesical artery initiating from the obturator artery. 2002 Jrnl. Amer. Assoc. Gynecol. Laparoscopists 9 49 Two cases were converted to laparotomy due to incomplete hemostasis of the uterine artery and obturator vein. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online June 2022). < n.1618
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