gill pouch
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gill pouch — /gil/. See branchial pouch. [1900 05] * * * gill pouch noun One of a pair of outgrowths on the wall of the pharynx, found in cyclostomes and present at the embryonic stage in all vertebrates, developing, in fish, into openings (gill slits)… … Useful english dictionary
gill pouch — /gil/. See branchial pouch. [1900 05] * * * … Universalium
Gill — A gill is an anatomical structure found in many aquatic organisms. It is a respiration organ whose function is the extraction of oxygen from water and the excretion of carbon dioxide. The microscopic structure of a gill is such that it presents a … Wikipedia
branchial pouch — Embryol. one of a series of rudimentary outcroppings of the inner pharyngeal wall, corresponding to the branchial grooves on the surface. Also called gill pouch, pharyngeal pouch. * * * … Universalium
branchial pouch — noun : one of the respiratory cavities in the branchial clefts of cyclostomes and some sharks * * * Embryol. one of a series of rudimentary outcroppings of the inner pharyngeal wall, corresponding to the branchial grooves on the surface. Also… … Useful english dictionary
pharyngeal pouch — n any of a series of evaginations of ectoderm on either side of the pharynx that meet the corresponding external furrows and give rise to the branchial clefts of the vertebrate embryo * * * (branchial pouch, visceral pouch) any of the paired… … Medical dictionary
branchial sac — gill pouch (the sac containing the gills and communicating with the mouth cavity and with the exterior in Myxini and Petromyzontiformes). Also called ear sac and probably meant to be any pouch or sac surrounding the gills in fishes generally … Dictionary of ichthyology
Spawn (biology) — The spawn (eggs) of a clownfish. The black spots are the eyes developing. Spawn refers to the eggs and sperm released or deposited, usually into water, by aquatic animals. As a verb, spawn refers to the process of releasing the eggs and sperm,… … Wikipedia
respiration — respirational, adj. /res peuh ray sheuhn/, n. 1. the act of respiring; inhalation and exhalation of air; breathing. 2. Biol. a. the sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells,… … Universalium
Frog — For other uses, see Frog (disambiguation). Frogs Temporal range: Triassic–present … Wikipedia
