MICROANATOMY

Detailed explanation-1: -The testicles form inside the abdomen of the male fetus. Between 25 and 35 weeks gestation (pregnancy), the baby’s testicles migrate down slender channels in the lower abdomen (inguinal canals) and settle into the scrotum.

Detailed explanation-2: -By week 9, Leydig cells produce testosterone and stimulate development of wolffian structures, including the epididymis and vas deferens. The testis resides in the abdomen near the internal ring until descent through the inguinal canal occurs at the beginning of the third trimester.

Detailed explanation-3: -The testes are 2 small organs that are found inside the scrotum. The testes make sperm.

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.