Vas Deferens – Class 12 | Chapter – 3 | Biology Short Notes Series PDF
Vas Deferens: Vas Deferens is also know as ductus deferens. The Vas Deferens is a muscular tube that is located within the spermatic cord and is a major component of the male reproductive system. It is a continuation of the epididymis and is involved in transporting spermatozoa from the epididymis to the ejaculatory ducts.
- It is 45 cm long and is initially convoluted but becomes straighter as it ascends in its course posterior to the testis and medial to the epididymis.
- It unites with the duct of the seminal vesicle to form the ejaculatory duct.
- The vas efferens, epididymis, vas deferens along with the rete testis forms the accessory sex ducts in males.
- It is a muscular tube that transports spermatozoa through the epididymis to the two ejaculatory ducts.
- The accompanying artery provides blood supply to the vas deferens. Also, the vas deferens is innervated by different nerve endings.
- From the epididymis, the vas deferens pass into the abdominal cavity via the inguinal canal.
- The terminal part of vas deferens is called the ampulla. This ampulla joins the seminal vesicles of the same side to form the ejaculatory duct.
- Two ejaculatory ducts are present and each of them receives sperm from the vas deferens and other secretions of the seminal vesicles. Both these ducts empty into a single urethra.
Functions of Vas Deferens
- The main function is to transport the spermatozoa from the epididymis all the way to the ejaculatory ducts.
- The sympathetic nervous system during ejaculation innervates the muscular layers of the ductus deferens causing them to generate strong peristaltic contractions to assist in the propulsion of the spermatozoa.
- It transports nature sperms to the urethra hence helps to prepare for ejaculation.
- The smooth muscles in the walls of the vas deferens during ejaculation reflexively contract causing sperms to move forward. This is peristalsis.
- Sperms are passed from vas deferens into the urethra mixing partially with the secretions from the male accessory glands such as the prostate glands, seminal vesicles and the bulbourethral glands.
- It is rendered with an artery of vas deferens which emerges from the superior or inferior vesical artery.
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