Vas deferens

The vas deferens, also called ductus deferens, is part of the male reproductive system of many vertebrates; these ducts transport sperm from the epididymis to the ejaculatory ducts in anticipation of ejaculation. It is a partially coiled tube that exits the abdominal cavity through the inguinal canal.

1. Memoona Arshad Group 11 Presented To: Sir Marrat Vas Deferens

2. Male Anatomy

3. Vas Deferens The vas deferens, also called  ductus deferens, is part of the male reproductive system of many vertebrates; these ducts transport sperm from the epididymis to the ejaculatory ducts in anticipation of ejaculation. It is a partially coiled tube which exits the abdominal cavity through the inguinal canal.

4. Structure There are two ducts, connecting the left and right epididymis with the seminal vesicles to form the ejaculatory duct in order to move  sperm. In humans, each tube is about 30 centimeters (1 ft) long, 3 to 5 mm (0.118 to 0.197 inches) in diameter and is muscular (surrounded by smooth muscle ). Its epithelium is pseudostratified columnar epithelium lined by stereocilia. They are part of the spermatic cords.

5. Structure (Contd..) Blood Supply The vas deferens is supplied by an accompanying artery (artery of vas deferens). This artery normally arises from the superior (sometimes inferior)  vesical artery, a branch of the internal iliac artery.

6. Structure (Contd..)

7. Function During ejaculation, the smooth muscle in the walls of the vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as  peristalsis. The sperm is transferred from each vas deferens into the urethra, partially mixing with secretions from the male accessory sex glands such as the seminal vesicles, prostate gland and the  bulbourethral glands, which form the bulk of semen.

8. Clinical Signification Contraception The procedure of  deferentectomy , also known as a vasectomy, is a method of contraception in which the vasa deferentia are permanently cut, though in some cases it can be reversed. A modern variation, which is also known as a vasectomy even though it does not include cutting the vas, involves injecting an obstructive material into the ductus to block the flow of sperm. 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.

9. Clinical Signification (Contd..) Disease The vas deferens may be obstructed, or it may be completely absent in a condition known as congenital absence of the vas deferens (CAVD, a potential feature of cystic fibrosis), causing male infertility. Acquired obstructions can occur due to infections. To treat these causes of male infertility, sperm can be harvested by testicular sperm extraction (TESE), microsurgical epididymal sperm aspiration (MESA), or other methods of collecting sperm cells directly from the testicle or epididymis .

10. Clinical Signification (Contd..) Uses in pharmacology and physiology The vas deferens has a dense sympathetic innervation ,  making it a useful system for studying sympathetic nerve function and for studying drugs that modify neurotransmission . It has been used: as a bioassay for the discovery of enkephalins, the endogenous opiates . to demonstrate quantal transmission from sympathetic nerve terminals . as the first direct measure of free Ca2+ concentration in a postganglionic nerve terminal . to develop an optical method for monitoring packeted transmission (similar to  quantal transmission ).

11. Other Animals Most vertebrates have some form of duct to transfer the sperm from the testes to the urethra. In cartilaginous fish and amphibians, sperm is carried through the  archinephric duct, which also partially helps to transport urine from the kidneys. In  teleosts, there is a distinct sperm duct, separate from the ureters, and often called the vas deferens, although probably not truly homologous with that in humans. The vas deferens loops over the ureter in placental mammals, but not in marsupial mammals .

12. Other Animals (Contd..) In cartilaginous fishes, the part of the archinephric duct closest to the testis is coiled up to form an  epididymis. Below this are a number of small glands secreting components of the seminal fluid. The final portion of the duct also receives ducts from the kidneys in most species .

13. Other Animals (Contd..) In  amniotes, however, the archinephric duct has become a true vas deferens, and is used only for conducting sperm, never urine. As in cartilaginous fish, the upper part of the duct forms the epididymis. In many species, the vas deferens ends in a small sac for storing sperm . The only vertebrates to lack any structure resembling a vas deferens are the primitive jawless fishes, which release sperm directly into the body cavity, and then into the surrounding water through a simple opening in the body wall .

14. Other Animals (Contd..)

15.  Tha nk You 