Testicle

Aka: Testicle, Testes, Testis, Testicular Anatomy

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II. Anatomy

  1. Testicular size (length)
    1. See Tanner Stage
    2. Pre-Puberty: 1.5 to 2 cm
    3. Post-Puberty: 4-5 cm
  2. Images
    1. uroMaleTestesGrayBB1148.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    2. uroMaleTestesXsGrayBB1149.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

III. Development

  1. Gestation 6-8 weeks: Testes develop from tissue within urogenital ridge
  2. Gestation 10-11 weeks: Androgen secretion
    1. Leydig cells produce Testosterone
    2. Wolffian duct (Mesonephric duct) differentiation
      1. Epididymis
      2. Vas deferense
      3. Seminal Vessicles
  3. Gestation 32-36: Testes descend into Scrotum
    1. Testes descend into Scrotum along gubernaculum (which tethers Testicle to distal Scrotum)
    2. Encased by peritoneal lining which forms processus vaginalis
    3. Spermatic cord forms with the trailing vessels
      1. Spermatic artery
      2. Pampiniform venous plexus
      3. Vas deferens

IV. Physiology

  1. Pituitary Gland
    1. Releases Luteinizing Hormone (LH)
  2. Testes
    1. Leydig cells in Testes releases Testosterone in response to LH release

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