HUMAN REPRODUCTIVE SYSTEM

HUMAN REPRODUCTIVE SYSTEM 1. Male Reproductive System It consists of paired testes, Accessory ducts, Accessory glands & external genitalia (penis). a. Paired testes ◆ Primary sexorgans that produce sperms & testosterone. ◆ Testes are formed within the abdomen. Soon after the birth or at the 8th month of pregnancy they descent into the scrotal sac (scrotum) through inguinalcanal. ◆ The low temperature (2-2.50 C less than the body temperature) of scrotum helps for proper functioning of testes and for spermatogenesis. ◆ Each testis is oval shaped. Length 4-5 cm, width: 2-3 cm. ◆ Each testis has about 250 testicular lobules. ◆ Each lobule contains 1-3 coiled seminiferous tubules. ◆ Seminiferous tubule is lined internally with spermatogonia (male germ cells) & Sertoli cells (supportingcells). ◆ Sertoli cells give shape and nourishment to developing spermatogonia. ◆ The regions outside the seminiferous tubules (interstitial spaces) contain small blood...