vas
[vas] (pl. va´sa) (L.) vas aber´rans 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.
va´sa efferen´tia vessels that convey fluid away from a structure or part.
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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.