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Animal Reproduction

Animal Reproduction. Male Reproductive Tract. Testes - male gonad located externally in scrotum except in birds produce sperm produce male hormone - testosterone. Scrotum. thermal regulatory organ temperature control necessary for sperm production cannot occur at body temperature.

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Animal Reproduction

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  1. Animal Reproduction

  2. Male Reproductive Tract • Testes - male gonad • located externally in scrotum except in birds • produce sperm • produce male hormone - testosterone

  3. Scrotum • thermal regulatory organ • temperature control necessary for sperm production • cannot occur at body temperature

  4. Scrotum • heat can cause infertility • spermatogenesis - maturation of sperm cells - takes about 50 days

  5. Epididymis • 3 portions • caput - head • corpora - body • cauda - tail • ****diagram

  6. Epididymis • 10 - 15 days for the sperm cells to pass through the epididymis • Functions - • maturation of sperm cells • storage of sperm cells

  7. Vas Deferens • passageway for sperm cells

  8. Accessory Glands • Seminal Vesicles • Prostate Gland • Cowper’s gland

  9. Accessory Glands • Provide 95-98% of total ejaculate volume

  10. Seminal Vesicles • secrete fructose - energy source for sperm • 40-80% of ejaculate volume

  11. Prostate Gland • secretes enzymes • 15-30 % of ejaculate volume

  12. Cowper’s Gland • cleanse and neutralize urethra • keep sperm from dying

  13. Urethra • passageway for semen • carries semen to the end of the penis

  14. Retractor Muscle • retracts penis • pulls the penis back within the sheath

  15. Sigmoid Flexor • extends penis from the sheath

  16. Penis • deposits semen in the female reproductive tract

  17. Sheath • encloses the penis • not present in primates

  18. Hormones • testosterone • functions • stimulate spermatogenesis • maturation of sperm cells

  19. Hormone functions • development of accessory sex glands • Libido - sex drive • builds muscle • Responsible for male characteristics

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