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vas[vas] (pl. va´sa) (L.)
vessel. adj., adj va´sal.
1. a blind tube sometimes connected with the epididymis; a vestigial mesonephric tube.
2. any anomalous or unusual vessel.
va´sa afferen´tia vessels that convey fluid to a structure or part.
va´sa bre´via short gastric arteries.
vas de´ferens ductus deferens.
va´sa efferen´tia vessels that convey fluid away from a structure or part.
va´sa lympha´tica lymphatic vessels.
va´sa prae´via the presentation, in front of the fetal head during labor, of the blood vessels of the umbilical cord where they enter the placenta.
va´sa rec´ta re´nis long U-shaped vessels arising from the efferent glomerular arterioles of juxtamedullary nephrons and supplying the renal medulla. Called also arteriolae rectae renis.
va´sa vaso´rum the small nutrient arteries and veins in the walls of the larger blood vessels.
small arteries distributed to the outer and middle coats of the larger blood vessels, and their corresponding veins.
Synonym(s): vessels of vessels
Etymology: L, vas, vessel
small blood vessels that supply the walls of the arteries and veins.
va·sa va·so·rum(vā'să vā-sō'rŭm) [TA]
Small arteries distributed to the outer and middle coats of the larger blood or lymph vessels, and their corresponding veins.