branchial sac
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branchial sac — noun : the dilated pharyngeal part of the alimentary canal in tunicates that has vascular walls pierced with clefts and functions as a gill … Useful english dictionary
sac — 1. sac [ sak ] n. m. • 1050 « étoffe grossière »; lat. saccus, gr. sakkos, d o. sémitique I ♦ A ♦ 1 ♦ (1120) Contenant formé d une matière souple pliée, assemblée, et ouvert seulement par le haut. ⇒ 1. poche. Grand, petit sac (⇒ sachet) . Sac… … Encyclopédie Universelle
ear sac — branchial sac or gill pouch (the sac containing the gills and communicating with the mouth cavity and with the exterior in Myxini and Petromyzontiformes). Probably meant to be any pouch or sac surrounding the gills in fishes generally … Dictionary of ichthyology
air sac — noun 1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways • Syn: ↑alveolus, ↑air cell • Derivationally related forms: ↑alveolate (for: ↑alveolus) • Hypernyms … Useful english dictionary
tunicate — /tooh ni kit, kayt , tyooh /, n. 1. Zool. any sessile marine chordate of the subphylum Tunicata (Urochordata), having a saclike body enclosed in a thick membrane or tunic and two openings or siphons for the ingress and egress of water. adj. Also … Universalium
dorsal lamina — noun : longitudinal membrane in tunicates that projects into the cavity of the branchial sac and is borne by the large median dorsal blood vessel; also : the vessel itself … Useful english dictionary
human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… … Universalium
circulation — circulable /serr kyeuh leuh beuhl/, adj. /serr kyeuh lay sheuhn/, n. 1. an act or instance of circulating, moving in a circle or circuit, or flowing. 2. the continuous movement of blood through the heart and blood vessels, which is maintained… … Universalium
Cyst — A closed sac or capsule, usually filled with fluid or semisolid material. * * * 1. A bladder. 2. An abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining. SEE ALSO: pseudocyst. [G. kystis, bladder] adventitious c.… … Medical dictionary
pouch — A pocket or cul de sac. SEE ALSO: fossa, recess, sac. antral p. a p. made in the antrum of the stomach of experimental animals. branchial pouches SYN: pharyngeal pouches. Broca p. SYN: puden … Medical dictionary
