- membranous sac
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(BRYOZOA: Stenolaemata)Membrane surrounding digestive and reproductive systems of zooid; the entosaccal and exosaccal cavity.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
membranous sac
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Membranous labyrinth — The membranous labyrinth. Latin labyrinthus membranaceus Gray s … Wikipedia
Membranous wall of tympanic cavity — Coronal section of right temporal bone. The m … Wikipedia
sac|cule — «SAK yool», noun. 1. a little sac. 2. the smaller of the two membranous sacs in the labyrinth of the internal ear. ╂[< Latin sacculus (diminutive) < saccus; see etym. under sack1 (Cf. ↑sack)] … Useful english dictionary
membranous conjunctivitis — severe conjunctivitis marked by the presence of a membrane on the inner surface of the lids formed by the profuse fibrinous exudation from the cul de sac, which on attempted removal leaves a raw, bleeding surface; it is caused by various bacteria … Medical dictionary
sac — n. any membranous bag or cavity … Dictionary of difficult words
yolk sac — noun 1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional • Syn: ↑vitelline sac, ↑umbilical vesicle, ↑vesicula umbilicus • Hypernyms: ↑sac 2. membranous structure enclosing the… … Useful english dictionary
Yolk sac — Not all yolk has to do with birds’ eggs. Human embryos have a yolk sac, a membrane outside the embryo but connected by a tube (the yolk stalk) though the umbilical opening to the embryo’s midgut. The yolk sac serves as an early site for … Medical dictionary
yolk sac — vitelline sac the membranous sac, composed of mesoderm lined with endoderm, that lies ventral to the embryo. It is one of the extraembryonic membranes. Its initially wide communication with the future gut is later reduced to a narrow duct passing … The new mediacal dictionary
amniotic sac — noun thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) • Syn: ↑amnion, ↑amnios • Derivationally related forms: ↑amniotic (for: ↑amnion), ↑amnionic … Useful english dictionary
yolk sac — noun Date: 1861 a membranous sac of most vertebrates that encloses the yolk, is attached in most forms (as in humans) through the yolk stalk with the intestinal cavity of the embryo, and is supplied with blood vessels that transport nutritive… … New Collegiate Dictionary
