Anatomy, Vasculature, and Innervation of the male reproductive tract

摘要: The male reproductive tract in mammals consists of testes, epididymides, ductus deferentes, accessory sex glands, and penis. testes differentiate the fetus from indifferent gonads after expression sex-determining region on Y chromosome (SRY) gene short arm chromosome. Fetal Leydig cells then secrete androgens that induce differentiation mesonephric (or Wolffian) duct into epididymis deferens some glands external genitalia a penis most eutherians, scrotum. size structural organization may vary with season, especially those species reproduce at restricted time year. This is particularly evident occur high latitudes where testicular development activity be regulated photoperiodically or there an endogenous circannual rhythm testis recrudescence, activity, regression, inactivity. organs receive visceral afferent efferent nerve supply, which derived group ganglia near spinal cord, celiac, aortic, caudal mesenteric, hypogastric, pelvic ganglia. scrotum cremaster muscle also somatic innervation. mesenteric hypogastric are combined cats, dogs, rats, rabbits but separate humans, apes, monkeys.