pseudocoeln.

Brit.

/ˈs(j)uːdəʊˌsiːl/, U.S.

/ˈsudoʊˌsil/

Forms: 1800s– pseudocele (irregular), 1800s– pseudocoele, 1900s– pseudocoel.

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

Etymology: < pseudo- comb. form + -coele comb. form. With sense 1 compare German Pseudocoel (1881 or earlier). Compare later pseudocoelom n.The form pseudocele apparently arose by confusion with -cele comb. form.

1. Zoology. A principal body cavity which is not completely lined with cells of mesodermal origin, and is thus distinguished from a true coelom; esp. one formed by persistence of the blastocoel of the early embryo (typical of certain protostome invertebrates: cf. pseudocoelomate adj. and n.).In quot. 1865: a diverticulum of the gut in a crinoid larva (pseudembryo) which gives rise to the adult coelom.

ΚΠ

1863 W. Thomson in Nat. Hist. Rev. 3 415 In Asteracanthion violaceus..the organs and appendages special to the pseudembryo, the pseudostome and pseudocele, are in abeyance.

1865 Philos. Trans. (Royal Soc.) 155 522 The loop-like canal beneath the posterior ciliated band is the extremely rudimentary pseudocele, and the round aperture is the pseudoproct.

1887 Jrnl. Microsc. Sci. Mar. 491 The adult body cavity [in the Cape species of Peripatus] comes entirely from pseudocœle; the enterocœle has no part in its formation.

1962 D. J. Merrell Evol. & Genetics xiii. 135 Among the animals with a pseudocoel..are six groups quite clearly similar and two phyla, the Acanthocephala and the Entoprocta, rather different from the others.

1987 R. D. Barnes Invertebr. Zool. (ed. 5) iii. 61/1 A coelom has a different embryogeny than does a pseudocoel. A coelom arises as a cavity within the embryonic mesoderm.

1995 E. W. Knight-Jones & J. S. Ryland in P. J. Hayward & S. Ryland Handbk. Marine Fauna N.W. Europe vii. 284 [In entoprocts] the body cavity of stalk, calyx, and tentacles is a pseudocoel filled with gelatinous mesenchymatous tissue.

2. Anatomy. B. G. Wilder's name for: the cavity between the two laminae of the septum pellucidum of the brain. rare. disused.

ΚΠ

1882 B. G. Wilder in Proc. Amer. Philos. Soc. 1880–81 19 544 Is there ever, except in man, any space or pseudocœlia, between its two halves?]

1889 B. G. Wilder in A. H. Buck Ref. Handbk. Med. Sci. VIII. 137/2 In these cases the pseudocœle has a greater extent and a somewhat rounded caudal end.

1905 Science 17 Feb. 268/2 Not only do the callosum and the fornicommissure constitute a single continuous area, but there is no sign whatever of the pseudocele (‘fifth ventricle’ or ventriculus septi pellucidi).

Derivatives

† pseudocoelian adj. Anatomy Obsolete rare (in the terminology of B. G. Wilder) designating the surface of the cavity of the septum pellucidum of the brain.

ΚΠ

1889 B. G. Wilder in A. H. Buck Ref. Handbk. Med. Sci. VIII. 136/1 Three kinds of surfaces..viz.: entocœlian, lined by endyma; ectocœlian, covered by pia; and pseudocœlian, with no distinct membrane.

pseudoˈcoelic adj. Zoology relating to or of the nature of a pseudocoel.

ΚΠ

1887 Jrnl. Microsc. Sci. Mar. 491 The heart and pericardium..are both pseudocœlic, and have nothing to do with enterocœle.

1956 Amer. Midland Naturalist 55 430 Even though there is little pseudocoelic space, in both the pharyngeal and cephalic regions the pseudocoel contains many large, finely granular cells.

1982 Internat. Jrnl. Parasitol. 12 145/2 Spherules..appearing to lie within enormously swollen gut cells with a bounding membrane separating them from the pseudocoelic cavity.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	pseudocoel
释义	pseudocoeln. Brit. /ˈs(j)uːdəʊˌsiːl/, U.S. /ˈsudoʊˌsil/ Forms: 1800s– pseudocele (irregular), 1800s– pseudocoele, 1900s– pseudocoel. Origin: Formed within English, by compounding. Etymons: pseudo- comb. form, -coele comb. form. Etymology: < pseudo- comb. form + -coele comb. form. With sense 1 compare German Pseudocoel (1881 or earlier). Compare later pseudocoelom n.The form pseudocele apparently arose by confusion with -cele comb. form. 1. Zoology. A principal body cavity which is not completely lined with cells of mesodermal origin, and is thus distinguished from a true coelom; esp. one formed by persistence of the blastocoel of the early embryo (typical of certain protostome invertebrates: cf. pseudocoelomate adj. and n.).In quot. 1865: a diverticulum of the gut in a crinoid larva (pseudembryo) which gives rise to the adult coelom. ΚΠ 1863 W. Thomson in Nat. Hist. Rev. 3 415 In Asteracanthion violaceus..the organs and appendages special to the pseudembryo, the pseudostome and pseudocele, are in abeyance. 1865 Philos. Trans. (Royal Soc.) 155 522 The loop-like canal beneath the posterior ciliated band is the extremely rudimentary pseudocele, and the round aperture is the pseudoproct. 1887 Jrnl. Microsc. Sci. Mar. 491 The adult body cavity [in the Cape species of Peripatus] comes entirely from pseudocœle; the enterocœle has no part in its formation. 1962 D. J. Merrell Evol. & Genetics xiii. 135 Among the animals with a pseudocoel..are six groups quite clearly similar and two phyla, the Acanthocephala and the Entoprocta, rather different from the others. 1987 R. D. Barnes Invertebr. Zool. (ed. 5) iii. 61/1 A coelom has a different embryogeny than does a pseudocoel. A coelom arises as a cavity within the embryonic mesoderm. 1995 E. W. Knight-Jones & J. S. Ryland in P. J. Hayward & S. Ryland Handbk. Marine Fauna N.W. Europe vii. 284 [In entoprocts] the body cavity of stalk, calyx, and tentacles is a pseudocoel filled with gelatinous mesenchymatous tissue. 2. Anatomy. B. G. Wilder's name for: the cavity between the two laminae of the septum pellucidum of the brain. rare. disused. ΚΠ 1882 B. G. Wilder in Proc. Amer. Philos. Soc. 1880–81 19 544 Is there ever, except in man, any space or pseudocœlia, between its two halves?] 1889 B. G. Wilder in A. H. Buck Ref. Handbk. Med. Sci. VIII. 137/2 In these cases the pseudocœle has a greater extent and a somewhat rounded caudal end. 1905 Science 17 Feb. 268/2 Not only do the callosum and the fornicommissure constitute a single continuous area, but there is no sign whatever of the pseudocele (‘fifth ventricle’ or ventriculus septi pellucidi). Derivatives † pseudocoelian adj. Anatomy Obsolete rare (in the terminology of B. G. Wilder) designating the surface of the cavity of the septum pellucidum of the brain. ΚΠ 1889 B. G. Wilder in A. H. Buck Ref. Handbk. Med. Sci. VIII. 136/1 Three kinds of surfaces..viz.: entocœlian, lined by endyma; ectocœlian, covered by pia; and pseudocœlian, with no distinct membrane. pseudoˈcoelic adj. Zoology relating to or of the nature of a pseudocoel. ΚΠ 1887 Jrnl. Microsc. Sci. Mar. 491 The heart and pericardium..are both pseudocœlic, and have nothing to do with enterocœle. 1956 Amer. Midland Naturalist 55 430 Even though there is little pseudocoelic space, in both the pharyngeal and cephalic regions the pseudocoel contains many large, finely granular cells. 1982 Internat. Jrnl. Parasitol. 12 145/2 Spherules..appearing to lie within enormously swollen gut cells with a bounding membrane separating them from the pseudocoelic cavity. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1863
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