PHIL 2130 Lecture Notes - Lecture 28: Vas Deferens, Ejaculatory Duct, Yolk Sac
6 May 2020
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Document Summary
Transports and stores sperm, assisting in their maturation- conveys them to the exterior. Includes epididymis, ductus deferens, ejaculatory ducts and urethra. Testes or testicles: -paired oval glands in scrotum. Develops near kidney and descends through inguinal canals near the 7th month of development. Tunica albuginea is internal to the tunica vaginalis-extends inward forming septa that divides testis into lobules. Each of 200-300 lobules containes 1-3 seminiferous tubules-sperm produced here through spermatogenesis. Seminiferous tubule cells: spermatogenic cells: sperm forming cells. The spermatagonia (stem cell) develop from primordial germ cells that arise in the yolk sac and enter the testes in the 5th week of development. Tight junctions form the blood-testis barrier, preventing the immune response against sperm cell surface antigens. Nourish spermatocytes, spermatids and sperm, phagocytize excess spermatid cytoplasm, control movements of spermatogenic cells, release sperm into the lumen, producing fluid for sperm transport, secreting inhibin, regulating effects of testosterone and fsh.
