- Types:
- show 31 types...
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yolk sac
membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
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umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
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amnion, amnios, amniotic sac
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
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chorion
the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
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coelenteron
the saclike body cavity of a coelenterate
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air bladder, float, swim bladder
an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
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air sac
any of the membranous air-filled extensions of the lungs of birds
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air sac
any of the thin-walled extensions of the tracheae of insects
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saccule, sacculus
a small sac or pouch (especially the smaller chamber of the membranous labyrinth)
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bladder, vesica
a distensible membranous sac (usually containing liquid or gas)
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acinus
one of the small sacs or saclike dilations in a compound gland
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bursa
a small fluid-filled sac located between movable parts of the body especially at joints
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cistern, cisterna
a sac or cavity containing fluid especially lymph or cerebrospinal fluid
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pocket, pouch
(anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
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cyst, vesicle
a small anatomically normal sac or bladderlike structure (especially one containing fluid)
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air cell, air sac, alveolus
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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pericardial sac
the membrane surrounding the heart
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gastric mill, gizzard, ventriculus
thick-walled muscular pouch below the crop in many birds and reptiles for grinding food
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utricle, utriculus
a small pouch into which the semicircular canals open
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dacryocyst, lacrimal sac, tear sac
either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands
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gall bladder, gallbladder
a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion
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atrial auricle, auricle, auricula atrii
a small conical pouch projecting from the upper anterior part of each atrium of the heart
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auricula, auricular appendage, auricular appendix
a pouch projecting from the top front of each atrium of the heart
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Golgi apparatus, Golgi body, Golgi complex, dictyosome
a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions)
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urinary bladder
a membranous sac for temporary retention of urine
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cheek pouch
a membranous pouch inside the mouth of many rodents (as a gopher)
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marsupium
an external abdominal pouch in most marsupials where newborn offspring are suckled
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scrotum
the external pouch that contains the testes
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bleb, blister, bulla
(pathology) an elevation of the skin filled with serous fluid
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follicle
any small spherical group of cells containing a cavity
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liposome
an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector
