Male Reproductive System

• Male Reproductive System

  A) Urethra

  B) Vas deferens

  C) Epididymis

  
• Testes

  • consist of many highly coiled tubes (seminiferous tubules – where sperm form) surrounded by several layers of connective tissue.
  • The Leydig cells that are scattered between the seminiferous tubules produce testosterone and other androgens.
• Ducts

  • from seminiferous tubules, the sperm pass into the epididymis. During ejaculation, the sperm are propelled from the epididymis through the muscular vas deferens.
• Glands

  • three sets of accessory glands – the seminal vesicles, prostate gland, and bulbourethral glands – add secretions to the semen, the fluid that is ejaculated.
  • Semen in the Female Reproductive Tract - males usually ejaculate 2-5 ml of semen, and each milliliter may contain 50-130 million sperm. Prostaglandins in the semen cause thinning of the mucus at the opening of the uterus and stimulate.
• Penis

  • composed of three cylinders of spongy erectile tissue derived from modified veins and capillaries.
  • During sexual arousal, the erectile tissue fills with blood from the arteries. As this tissue fills, the increasing pressure seals off the veins that drain the penis, causing it to engorge with blood.