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Animal/Dairy Science 434

Animal/Dairy Science 434 . Lec 3: Male Reproductive Tract Anatomy. Learning Objectives. To be able to describe the male reproductive system in the bull. Structure Function. Testis. Epididymis. Factory 1-25 X 10 9 sperm/day “Plant” must be air conditioned. Finishing School

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Animal/Dairy Science 434

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  1. Animal/Dairy Science 434 Lec 3: Male Reproductive Tract Anatomy

  2. Learning Objectives • To be able to describe the male reproductive system in the bull. • Structure • Function

  3. Testis Epididymis • Factory • 1-25 X 109 sperm/day • “Plant” must be air conditioned • Finishing School • Fluid Absorption • 8-25 X 109 sperm • membrane changes • nuclear & flagellar stabilization • motility, fertility • cytoplasmic droplet translocation Penis • Delivery System • Erection • Protrusion • Ejaculation Tail of Epididymis • Warehouse and Delivery • Storage 10-50 X 109 sperm • Sperm for 5-10 ejaculates • Smooth muscle contractions upon sexual stimulation Accessory Sex Glands • Alterations & Packaging • Metabolic substrates • Surface coatings • Transport for sperm

  4. Bull ReproductiveTract

  5. Reproductive Organs of the Bull

  6. Testis Reproductive Organs of the Bull

  7. Bull Testis • Tunica Vaginalis • parietal • visceral Tunica Albuginea

  8. Scrotum Bull Tract • Thermosensor • Radiator • Protective sac

  9. Bull Tract Longitudinal Section Cross Section

  10. testicular parenchyma mediastinum Scrotal Cross Section

  11. Testis Testicular Parenchyma Mediastinum

  12. Seminiferous Tubule Tunica Albuginea Rete Testis (within the mediastinum) Structure of the Testis

  13. The Testis Mediastinum Rete Testis Seminiferous Tubule

  14. Structure of the Testis Seminiferous Tubule Tunica Albuginea Rete Testis (within the mediastinum)

  15. Spermatic Cord Vas Deferens Caput Epididymis Vas Efferentia 6-12 tubules Corpus Epididymis Cauda Epididymis Structure of the Testis • Vasectomy

  16. Spermatic Cord Vas Deferens Caput Epididymis Vas Efferentia 6-12 tubules Corpus Epididymis Structure of the Testis • Vasectomy Seminiferous Tubule Tunica Albuginea Rete Testis (within the mediastinum) Cauda Epididymis

  17. Spermatic Chord Pampiniform Plexus • Vascular, lymphatic and nerves • Heat exchanger • Houses cremaster muscle Testicular Artery • Pampiniform Plexus • Counter Current Exchange • 39°C - 34°C • 70 ng T/ml - 4.8 ng T/ml

  18. Testis Arterial Pulse

  19. Spermatic Chord Vas Deferens Cremaster Muscle Pampiniform Plexus Parietal Tunica Vaginalis

  20. Tunica Dartos Bull Tract

  21. Contraction of the Tunica Dartos Testis • Tunica Dartos • Smooth muscle • Androgen dependent(Testosterone)

  22. Gubernaculum Bull Tract

  23. Bull Tract Pelvic Genitalia

  24. Pelvic Genitalia of the Bull Pelvic Urethra Muscle

  25. Bulb of the Penis

  26. Retractor Penis Muscle Sigmoid Flexure Reproductive Organs of the Bull Prostate Rectum Cowpers Gland Seminal Vesicles Ampulla Bladder Vas Deferens Glans Penis Caput Epididymis Scrotum Testis Cauda Epididymis Gubernaculum

  27. Cross Section of Bull Penis

  28. Penis Cross Section Corpus Cavernosum Urethra Corpus Spongiosum

  29. Arterial Supply

  30. Glans Penis

  31. Glans Penis

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