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Animal Reproduction

Explore the male reproductive system, from the testes producing sperm to the functions of accessory glands. Learn about the role of testosterone and the vital structures like the scrotum, epididymis, and vas deferens. Discover how hormones influence male characteristics and libido.

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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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