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Sexual Development

Sexual Development. Genitals for both sexes develop from 3 identical structures Genital tubercle: an anterior bud that becomes the glands or clitoris Urogenital folds: tissue folds that lie lateral to the tubercle

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Sexual Development

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  1. Sexual Development • Genitals for both sexes develop from 3 identical structures • Genital tubercle: an anterior bud that becomes the glands or clitoris • Urogenital folds: tissue folds that lie lateral to the tubercle • Labioscrotal folds: larger pair of tissue that lie lateral to the urogenital folds

  2. Sexual Development • Those 3 structures start to show sexual development around week 9 and by week 12 sex is distinctive • Since genitals develop from the same tissue the penis is homologous to the clitoris and the scrotum is homologous to the labia majoria • Testes develop by the kidneys and are pulled into the scrotum by the gubernaculum

  3. Male Anatomy • Perineum: a diamond shaped region that contains the genitals and anus • Scrotum: a divided pouch that contains the testes • Median septum: marked by the perineal raphe, extends from the penis to the anus • Testes cannot produce sperm at body temp, the scrotum is about 2C cooler, testes are raised or lowered for best temp

  4. Testes • Testes produce sperm • Tunica albuginea: is a white fibrous capsule, protection, fight infection • The testes are divided into wedge shaped lobules that contain seminiferous tubules where sperm is produced • The tubules lead into the rete testis where sperm partially mature

  5. Sperm Ducts • Efferent ductules: carry sperm to the epididymis • Epididymis: sperm fully matures and are stored, sperm are fertile for 40-60 days then die and are reabsorbed • Vas Deferens: a long muscular tube that connects the testes to the ejaculatory duct • Ejaculatory duct: short tube where sperm, prostate fluid and vesicle fluid are mixed to become semen as it enters the urethra

  6. Semen • Seminal vesicles: 60% of the semen neutralizes vaginal secretions, has fructose for energy and is sticky to ensure sperm sticks to vaginal walls so they don’t fall out • Prostate: 30% of semen activates sperm • Cowper's gland: produces clear fluid that coats glands for entry of vagina • Sperm: 10% of semen

  7. Penis • The penis function is to deliver sperm to vagina, has three parts root, shaft, glands • Prepuce: layer of skin that covers the glands • Erectile tissue: tissue that fills with blood to erect the penis • Corpus sponginosum: single body that surrounds the urethra • Corpus cavernosa: twin bodies that are inferior to the sponginosum

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