spiral valve — n a series of crescentic folds of mucous membrane somewhat spirally arranged on the interior of the gallbladder and continuing into the cystic duct called also valve of Heister … Medical dictionary
spiral valve of cystic duct — spiral valve of Heister plica spiralis … Medical dictionary
spiral valve — a spiral or helical fold in the midgut of Petromyzontiformes, Elasmobranchii, Holocephali and some primitive Teleostomi. Functions to increase the surface area for processing food without lengthening the intestine … Dictionary of ichthyology
spiral valve — noun : a continuous spiral ridge of mucous membrane in the large intestine of fishes of the more primitive groups (as elasmobranchs, ganoids, dipnoans) that makes a number of complete turns increasing the surface for absorption and retarding the… … Useful english dictionary
valve of Heister — valve of Hei·ster hī stər n SPIRAL VALVE Heister Lorenz (1683 1758) German anatomist and surgeon. Heister was one of the founders of scientific surgery. His works on medicine, anatomy, and surgery were widely read for several generations. His… … Medical dictionary
valve — 1. A fold of the lining membrane of a canal or other hollow organ serving to retard or prevent a reflux of fluid. 2. Any formation or reduplication of tissue, or flaplike structure … Medical dictionary
Screw valve — Screw Screw (skr[udd]), n. [OE. scrue, OF. escroue, escroe, female screw, F. [ e]crou, L. scrobis a ditch, trench, in LL., the hole made by swine in rooting; cf. D. schroef a screw, G. schraube, Icel. skr[=u]fa.] 1. A cylinder, or a cylindrical… … The Collaborative International Dictionary of English
intestinal valve — a fold in the intestine which increases surface area for processing food without lengthening the intestine. Found in Elasmobranchii and Acipenseridae, for example. See also ring, scroll and spiral intestinal valves … Dictionary of ichthyology
digestive system, human — Introduction the system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract (alimentary canal), or the series of structures and organs through which food and liquids pass… … 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
