GENERAL HISTOLOGY

Detailed explanation-1: -The testes secrete testosterone, which is necessary for proper physical development in boys. In adulthood, testosterone maintains libido, muscle strength, and bone density. Disorders of the testes are caused by too little testosterone production.

Detailed explanation-2: -They contain very fine-coiled tubes, called seminiferous tubules and are covered with tough membrane, tunica albuginea. Primary cell types in testes are germ cells, Sertoli cells which secrete inhibin, Leydig cells which produce and secrete androgens, peritubular hyoid cells, macrophages and epithelial cells.

Detailed explanation-3: -The Testis has following three functions. First, it produces spermatozoa, the male gametes. Second, it synthesizes testosterone, the principal male sex hormone. Third, it participates with the hypothalamus-pituitary unit in regulating reproductive function.

Detailed explanation-4: -Normal Testis Development. At 3 weeks of development, the germ cells migrate from the yolk sac to the genital ridge. From the 4th to the 8th week, in male embryos with a normal sex determining region on the short arm of the Y chromosome, the germ cells coalesce to form the primordial testis.