mesocoeln.

Brit.

/ˈmɛsə(ʊ)siːl/, U.S.

/ˈmɛzoʊˌsil/; see also meso- comb. form.

Forms: 1800s– mesocele, 1800s– mesocoele, 1900s– mesocoel.

Origin: Formed within English, by compounding. Etymons: meso- comb. form, -coele comb. form.

Etymology: < meso- comb. form + -coele comb. form, in sense 1 after mesocoelia n. Compare metacoel n.

1. Anatomy and Zoology. In forms mesocele, mesocoele. The cerebral aqueduct or its embryonic precursor. rare.

ΚΠ

1884 T. J. Parker Zootomy 23 They contain a cavity, the aqueduct of Sylvius, or mesocœle.

1896 B. G. Wilder in Science 25 Dec. 947/1 The Latin (international) forms are metacoelia and mesocoelia; the national English forms metacele and mesocele.

1898 Science 4 Feb. 151/2 The brain as far as the cephalic orifice of the mesocele (‘aqueduct’).

1981 Jrnl. Compar. Neurol. 202 309 Tectal neurons in this species [sc. the rhesus monkey] are generated in the ventricular and subventricular zones surrounding the mesocoele (future Sylvian aqueduct) within the first third of the 165-day gestation period.

2. Zoology. The middle division of a tripartite coelom; (in hemichordates) the coelomic compartment of the mesosoma or collar; (in echinoderms) the part of the coelom forming the water-vascular system.

ΚΠ

1947 T. Gislén in Zoologiska Bidrag från Uppsala 25 405 A being which had fixed itself with the front end on the bottom or which crept on the front end had..already advanced far in the reduction of its right foremost coelom, or, to put it as Heider did, its right protocoele. The other two pairs of coeloms, the hydrocoeles (collar coeloms) and somatocoeles or, more neutrally, the meso- and metacoeles, may have been relatively unaffected.

1967 C. P. Hickman Biol. Invertebr. xxix. 611/2 The coelom of hemichordates is divided into three segments: the proboscis, or protocoel, with a single cavity; the collar, or mesocoel, with two cavities; and the trunk, or metacoel, with two cavities.

1970 R. B. Brown Gen. Biol. xxix. 391 Each of these outpouchings then divides into three..: a procele, a mesocele, and a metacele.

1995 C. Nielsen Animal Evol. xlviii. 367 [In echinoderms] the coelomic cavity just below the madreporite, the madreporic chamber, is in open connection with the stone canal, which is a part of the left mesocoel.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesocoel
释义	mesocoeln. Brit. /ˈmɛsə(ʊ)siːl/, U.S. /ˈmɛzoʊˌsil/; see also meso- comb. form. Forms: 1800s– mesocele, 1800s– mesocoele, 1900s– mesocoel. Origin: Formed within English, by compounding. Etymons: meso- comb. form, -coele comb. form. Etymology: < meso- comb. form + -coele comb. form, in sense 1 after mesocoelia n. Compare metacoel n. 1. Anatomy and Zoology. In forms mesocele, mesocoele. The cerebral aqueduct or its embryonic precursor. rare. ΚΠ 1884 T. J. Parker Zootomy 23 They contain a cavity, the aqueduct of Sylvius, or mesocœle. 1896 B. G. Wilder in Science 25 Dec. 947/1 The Latin (international) forms are metacoelia and mesocoelia; the national English forms metacele and mesocele. 1898 Science 4 Feb. 151/2 The brain as far as the cephalic orifice of the mesocele (‘aqueduct’). 1981 Jrnl. Compar. Neurol. 202 309 Tectal neurons in this species [sc. the rhesus monkey] are generated in the ventricular and subventricular zones surrounding the mesocoele (future Sylvian aqueduct) within the first third of the 165-day gestation period. 2. Zoology. The middle division of a tripartite coelom; (in hemichordates) the coelomic compartment of the mesosoma or collar; (in echinoderms) the part of the coelom forming the water-vascular system. ΚΠ 1947 T. Gislén in Zoologiska Bidrag från Uppsala 25 405 A being which had fixed itself with the front end on the bottom or which crept on the front end had..already advanced far in the reduction of its right foremost coelom, or, to put it as Heider did, its right protocoele. The other two pairs of coeloms, the hydrocoeles (collar coeloms) and somatocoeles or, more neutrally, the meso- and metacoeles, may have been relatively unaffected. 1967 C. P. Hickman Biol. Invertebr. xxix. 611/2 The coelom of hemichordates is divided into three segments: the proboscis, or protocoel, with a single cavity; the collar, or mesocoel, with two cavities; and the trunk, or metacoel, with two cavities. 1970 R. B. Brown Gen. Biol. xxix. 391 Each of these outpouchings then divides into three..: a procele, a mesocele, and a metacele. 1995 C. Nielsen Animal Evol. xlviii. 367 [In echinoderms] the coelomic cavity just below the madreporite, the madreporic chamber, is in open connection with the stone canal, which is a part of the left mesocoel. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1884
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