myoidn.adj.2
/ˈmʌɪɔɪd/, U.S. /ˈmaɪˌɔɪd/ A. n.
A section of the inner segment of a retinal rod or cone, which in certain vertebrates can contract and elongate in response to changes in light levels.
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the world > life > the body > sense organ > sight organ > parts of sight organ > [noun] > retina > rods or cones
rod1844
cone1867
rod cell1877
myoid1900
1900 Lancet 7 July 7/2 The cell-body, traced from the cuticular end, begins as a distinct granular protoplasmic swelling, called the myoid.
1915 Jrnl. Compar. Neurol. 25 539 Later, in 1890, Angelucci borrowed the term ‘myoid’ which Engelmann had given to the contractile portion of the cone's inner member and applied it to the corresponding part of the rod.
1915 Science 24 Dec. 916/2 The so-called ‘myoid’ of the cone-visual cell shortens to a marked degree when..the retina is exposed to light.
1942 G. L. Walls Vertebr. Eye iii. 56 The myoid may be quite non-contractile and thus undeserving of the name, as in man.
1961 S. Duke-Elder Syst. Ophthalmol. II. iii. 241 In man and other mammals the inner segment of the rod is an elongated slightly barrel-shaped structure..made up of two elements, an outer ellipsoid and an inner myoid.
1972 Vision Res. 12 1841 The myoid is a cylindrical part of the photoreceptor connecting the region of the cell containing its nucleus with the region containing the ellipsoid.
1989 Encycl. Brit. XXVII. 148/2 The rod myoids (contractile elements) are contracted in darkness so that the rod outer segments are withdrawn from the pigment and exposed fully to the available light.
1997 Proc. National Acad. Sci. U.S.A. 94 4732/1 In bovine retina, the inner segments of rod cells and the myoids of some cone cells were labeled.
B. adj.2
Of, relating to, or designating the myoid of a retinal cone or rod.
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the world > life > the body > sense organ > sight organ > parts of sight organ > [adjective] > retina > other parts of retina
Müllerian1860
cilio-retinal1877
myoid1907
macular1909
lentoid1940
1907 Amer. Naturalist 41 366 Because of the myoid substance the cones, unlike the rods, may alter their length.
1973 Philos. Trans. (Royal Soc.) B. 266 501 The myoid region typically contains no droplet.
1978 Jrnl. Cell Biol. 78 247 The product of the mean myoid microtubule number..and the myoid length remains essentially constant during myoid elongation.
1998 Anat. Rec. 252 453 Dark-adapted rod inner segments were much shorter with a thicker myoid region.
This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).
myoidadj.1
/ˈmʌɪɔɪd/, U.S. /ˈmaɪˌɔɪd/ Histology.
Composed of, resembling, characteristic of, or involving muscle tissue or cells.
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the world > life > the body > structural parts > muscle > muscle substance > [adjective]
muscular1673
musculary1679
staminal1830
striated1846
brawn-like1849
striped1850
myoid1857
smooth1860
myoepithelial1881
myoblastic1890
sarcoplasmic1891
myofibrillar1927
myoplasmic1960
myofibrillary1975
1857 R. Dunglison Med. Lexicon (rev. ed.) 616/1 Myoid, an epithet given to tumours composed of fibre cells or muscular fibres of organic life.
1924 Amer. Naturalist 58 283 If we accept the statements made by some investigators that the cilia are the ends of myoid fibrils..[etc.].
1970 Q. Rev. Biol. 45 320/1 Waves of excitation pass from cell to cell across the tissue, spreading the contractile response. This is referred to as ‘myoid’ conduction.
1993 Ultrastructural Pathol. 17 195 The immunohistochemical and ultrastructural findings of the proliferating myoid cells suggest a possible derivation from smooth-muscle vascular cells.
2002 Pathol. Internat. 52 69 These ultrastructural and immunohistochemical features..justify this type of neoplasm being categorized as perivascular myoid tumor.
This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).
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n.adj.21900adj.11857