vas deferens

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vas

 [vas] (pl. va´sa) (L.)
vessel. adj., adj va´sal.
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.
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.

duc·tus def·er·ens

[TA]
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.

vas deferens

[def′ərənz] pl. vasa deferentia
Etymology: L, vas + deferens, carrying away
the extension of the epididymis of the testis that ascends from the scrotum into the abdominal cavity and joins the seminal vesicle to form the ejaculatory duct. It is enclosed by fibrous connective tissue with blood vessels, nerves, and lymphatics and passes through the inguinal canal as part of the spermatic cord. Also called deferent duct, ductus deferens, spermatic duct, testicular duct. See also testis.

duc·tus def·er·ens

(dŭk'tŭs def'ĕr-enz) [TA]
The secretory duct of the testicle, running from the epididymis, of which it is the continuation, to the prostatic urethra where it terminates as the ejaculatory duct.
Synonym(s): arteriola glomerularis efferens [TA] , deferent duct, spermatic duct, spermiduct (1) , vas deferens.
Enlarge picture
VAS DEFERENS AND OTHER MALE ORGANS

vas deferens

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 deferens

The 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.

Vas deferens

A tube that is a continuation of the epididymis. This tube transports sperm from the testis to the prostatic urethra.

vas

pl. vasa [L.] a vessel.

vas aberrans
1. a blind tube sometimes connected with the epididymis; a vestigial mesonephric tube.
2. any anomalous or unusual vessel.
vas afferentia
vessels that convey fluid to a structure or part.
vas brevia
short vessels such as the gastric arteries.
vas deferens
the excretory duct of the testis which conveys spermatozoa from the tail of the epididymis to the pelvic urethra and which sometimes unites with the excretory duct of the seminal vesicle to form the ejaculatory duct; called also ductus deferens.
vas efferentia
vessels that convey fluid away from a structure or part.
vas lymphatica
lymphatic vessels.
vas recta
straight vessels, such as the long U-shaped vessels arising from the efferent glomerular arterioles of juxtamedullary nephrons and supplying the renal medulla.
vas vasorum
the small nutrient arteries and veins in the walls of the larger blood vessels.
References in periodicals archive ?
1 g), the entire vasa deferentia and their contents were homogenized in a 5-ml round body tissue grinder.
The concentration of sperm was also determined by dividing the total number of sperm by the weight of the vasa deferentia.
In general, the male genital system consists of a common genital chamber, the vasa deferentia and the testes.
Towards the vasa deferentia and shortly before the testes open into the vas deferens, the epithelium flattens and no spermatozoa can be observed in the tissue.
There was clear evidence in our experiments that the sperm reserves of some males were depleted in relation to the number of mating opportunities, as evidenced at the replicate level by progressively smaller mean vasa deferentia weight (VDW) with declining sex ratio (Fig.
Sperm were present in 74/75 (99%) of the vasa deferentia examined: March 8/9, April 27/27, May 21/21, June 3/3, July 4/4, August 4/4, September 3/3, October 4/4.
Breeding presumably occurs in spring although sperm was present in the vasa deferentia during all months examined.
Sperm was present in the vasa deferentia from all months examined: April-May, July-September.
Sperm were present in the vasa deferentia of all males during the following months (sample sizes in parentheses): C.
Epididymides and vasa deferentia of spermiogenic males contained sperm.