section_path: Biology/Reproductive system
section_name: Reproductive system
paragraph_text: Reproductive system
  
  The internal male genitalia consist of the testicles, gonads that produce male gametes called sperm, the prostate, seminal vesicles, and bulbourethral glands, accessory glands that partake in sperm health, the epididymides, organs that store sperm cells, and the vasa deferentia and ejaculatory ducts, tubular structures that transfer the mature sperm to the urethra.
  
  The external male genitalia consist of the penis, an organ that expels semen, and the scrotum, a pouch of skin housing the testicles.
  
  The male reproductive system's function is to produce semen, which carries sperm and thus genetic information that can unite with an egg within a woman. Since sperm that enters a woman's uterus and then fallopian tubes goes on to fertilize an egg which develops into a fetus or child, the male reproductive system plays no necessary role during the gestation. The study of male reproduction and associated organs is called andrology.
  
  Testosterone stimulates the development of the Wolffian ducts, the penis, and closure of the labioscrotal folds into the scrotum. Another significant hormone in sexual differentiation is the anti-Müllerian hormone, which inhibits the development of the Müllerian ducts. For males during puberty, testosterone, along with gonadotropins released by the pituitary gland, stimulates spermatogenesis.