Everything about Vas Deferens totally explained
The
vas deferens (plural: vasa deferentia), also called
ductus deferens, (
Latin: "carrying-away vessel") is part of the
male anatomy of some species, including humans.
Structure
There are two such ducts, connecting the left and right
epididymis to the
ejaculatory ducts in order to move
sperm. Each tube is about 30 centimeters long (in humans) and are muscular (surrounded by
smooth muscle).
They are part of the
spermatic cords.
Function in ejaculation
During
ejaculation the smooth muscle in the walls of the ductus deferens or vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as peristalsis. The sperm is transferred from the vas deferens into the urethra, collecting secretions from the male accessory sex glands such as the seminal vesicles, prostate gland and the bulbourethral glands, which form the bulk of semen.
Significance in contraception
The procedure of
deferentectomy, popularly known as a
vasectomy, is a method of
contraception in which the vasa deferentia (Latin plural) are permanently cut, though in some cases it can be reversed. A modern variation, which is also popularly known as a vasectomy even though it doesn't include cutting the vas, involves injecting an obstructive material into the ductus to block the flow of sperm. In either procedure, active sperm may be still be present in the
seminal vesicles for as long as 12 weeks.
Investigational attempts for male contraception have focused on the vas with the use of the
intra vas device and
reversible inhibition of sperm under guidance (RISUG).
Blood supply
The vas deferens is supplied by an accompanying artery (artery of vas deferens). This artery normally arises from the superior vesical artery, itself a branch of the internal iliac artery.
Additional images
Image:Illu repdt male.jpg|Male reproductive system.
Image:Gray402.png|Coronal section of pelvis, showing arrangement of fasciæ. Viewed from behind.
Image:Gray547.png|The relations of the femoral and abdominal inguinal rings, seen from within the abdomen. Right side.
Image:Gray1146.png|The spermatic cord in the inguinal canal.
Image:Gray1152.png|Fundus of the bladder with the vesiculæ seminales.
Image:Gray1156.png|Vertical section of bladder, penis, and urethra.
Image:Gray1160.png|Prostate with seminal vesicles and seminal ducts, viewed from in front and above.
Image:Illu quiz prostate01.jpg|Prostate
Image:Vas deferens.JPG|Microscopic cross section.
Further Information
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