Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
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.
the secretory duct of the testicle, extending from the epididymis, of which it is the continuation, to its merging with the excretory duct of the seminal gland to form the ejaculatory duct.
vas deferens(dĕf′ər-ənz, -ə-rĕnz′)
n. pl. vasa deferentia (dĕf′ə-rĕn′shē-ə)
A duct through which semen is carried from the epididymis of each testicle to an ejaculatory duct.
duc·tus def·er·ens(dŭk'tŭs def'ĕr-enz) [TA]
The secretory duct of the testis, a continuation of the epididymis. This slim, muscular tube, approx. 18 in (45.7 cm) long, transports the sperm from each testis to the ejaculatory duct, which empties into the prostatic urethra.Synonym: ductus deferens See: illustration; genitalia for illus.
See also: vas
vas deferensThe fine tube that runs up in the SPERMATIC CORD on each side from the EPIDIDYMIS of the TESTICLE, over the pubic bone and alongside the bladder to end by joining the seminal vesicle near its entry to the PROSTATE GLAND. The vas deferens conveys spermatozoa from the testicle to the seminal vesicle. See also VASECTOMY.
vas deferens(pl. vasa deferentia) a duct conveying sperm from the TESTIS to the exterior in invertebrates or, in vertebrates, to the cloaca or URETHRA and hence to the outside.
A tube that is a continuation of the epididymis. This tube transports sperm from the testis to the prostatic urethra.
Mentioned in: Testicular Self-Examination