(anatomy, usually plural) One of a number of straight vasa (tubes), specifically:
- (sometimes , more fully, “vas rectum renis”) Any one of many straight capillaries in the kidney that branch off from the arteriolae efferentes (efferent arterioles) of juxtamedullary nephrons, enter the medulla, and surround the loop of Henle, where they function to absorb water and to secrete salt and urea into the renal interstitium, thereby facilitating the production of concentrated urine. [1858–].
(renal capillary): arteriola recta renis, venula recta renis.
Origin of vas-rectum
- First attested in 1750; Latin: vās (“vessel”) + rēctum (neuter nominative singular of rēctus, “straight”) = “straight vessel”.