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Animal / Dairy Science 434

Animal / Dairy Science 434. Lec 4: Comparative Male Anatomy. Testis. Species Testis Wt. % Of Orientation (grams) Body Wt. bull 300+ .03 vertical ram 250 .3 vertical boar 350 .2 oblique stallion 200 .03 horizontal dog 25 .2 oblique

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Animal / Dairy Science 434

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  1. Animal / Dairy Science 434 Lec 4: Comparative Male Anatomy

  2. Testis Species Testis Wt. % Of Orientation (grams) Body Wt. bull 300+ .03 vertical ram 250 .3 vertical boar 350 .2 oblique stallion 200 .03 horizontal dog 25 .2 oblique rabbit 2.5 .1 vertical human 25 .03 vertical

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

  4. Reproductive Organs of the Bull Vertical

  5. Ram Vertical

  6. Boar Oblique

  7. Dog Oblique

  8. Horizontal Stallion

  9. Human Vertical

  10. Testis Orientation Bull Tail Head

  11. Testis Species Testis Wt. % Of Orientation (grams) Body Wt. bull 300+ .03 vertical ram 250 .3 vertical boar 350 .2 oblique stallion 200 .03 horizontal dog 25 .2 oblique rabbit 2.5 .1 vertical human 25 .03 vertical

  12. Ram SeminalVesicles Pelvic Urethral Muscle Cowper’sGland Ampulla Prostate Bladder Vas Deferens BulbospongiosusMuscle No Body of the Prostate

  13. Cowper’s Gland SeminalVesicles Prostate No Ampulla Large Cowper’s Vas Deferens BulbospongiosusMuscle Pelvic Urethral Muscle

  14. Prostate Cowper’s Gland SeminalVesicles Ampulla BulbospongiosusMuscle No Disseminate Prostate Pelvic Urethral Muscle Vas Deferens

  15. Human No Disseminate Prostate

  16. Dog Pelvic Tract No Seminal Vesicles or Disseminate Prostate Pelvic Urethral Muscle Prostate Bladder Vas Deferens Bulbospongiosus Muscle

  17. Cat (Tom) Reproductive Tract Cowper’s Gland Vas Deferens Prostate Corpus Cavernosum Glans Penis Crus Penis Ampulla No Seminal Vesicles or Disseminate Prostate

  18. Cat (Tom) Reproductive Tract Note how close the cowper’s gland is to the penis in the cat.

  19. Cat Glans Penis

  20. Feline Anatomy: Erection and Mating

  21. Accessory Glands Species Seminal Prostate Cowper's Vesicles body disseminate bull ++ + + + ram + - + ++ boar +++ + + +++ stallion +++ ++ - (+) + dog - ++ - - Cat - ++ - ++ human + ++ - +

  22. Accessory Gland Secretions Gel Gel Clot Enzyme Clot

  23. Penis Types Muscular-Vascular Fibroelastic

  24. Human Penis Cross Section Blood Vessels Corpus Cavernosum Large Veins Urethra Corpus Spongiosum

  25. Internal Prepuce Urethral Process Stallion Raphe Bull Glans Penis Free End of Penis Human Filiform Appendage Ram Cat Boar

  26. Comparison of Penis Types

  27. Human

  28. Sigmoid Flexure Boar Bull Fibroelastic Penis

  29. Muscular-Vascular Penis Type Stallion

  30. The Penis

  31. Erection and Ejaculation Characteristics Species Speed of Ejaculate Semen Sperm Sperm Erection Time Volume Conc. Number bull rapid short medium medium- medium high ram rapid short small high medium boar rapid long large low high stallion slow moderate large low medium dog slow long large low low human slow moderate medium low low Large Testes = high sperm numbers Large accessory glands = large volume of the ejaculate with lower concentration of sperm

  32. Sertoli Cells Leydig Cells Seminiferous Tubule Primary Spermatocyte Spermatogonium • Support spermatogenesis Myoid Cells Secondary Spermatocyte • Testosterone synthesis Round Spermatids Spermatids Basement Membrane Capillary

  33. Seminiferous Tubules

  34. Seminiferous Tubule

  35. Sertoli Cell Sertoli Cell

  36. Interstitial Tissue (space) Capillary Leydig Cell

  37. Capillary Leydig Cells

  38. Epididymis Basal Cell Stereo-Cillia Principal Cell

  39. Cauda Epididymis near Vas Deferens

  40. Sperm Smooth Muscle Vas Deferens

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