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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.
vas aberrans(1) Aberrant ductule; ductulus aberrans [NA6].
(2) (Superior aberrant ductule); (ductulus aberrans superior) [NA6].
(3) A nonspecific term applicable to any vessel with an anomalous course.
1. A narrow tube varying in length from 112 to 14 in (3.8 to 35.6 cm), occasionally found connected with the lower part of the canal of the epididymis or with the commencement of the vas deferens.
2. A vestige of the bile ducts sometimes found in the liver.
See also: vas