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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. Ram

  5. Boar

  6. Dog

  7. Rectum Ampulla Seminal Vesicles Ureter Prostate Gland Vas Deferens Cowper’s Gland Spermatic Cord Retractor Penis Muscle Cauda Epididymis Caput Epididymis Gubernaculum Corpus Epididymis Glans Penis Testis Stallion

  8. Human

  9. Testis Orientation Bull Tail Head

  10. 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

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

  12. No Ampulla Large Cowper’s

  13. No Disseminate Prostate

  14. Human No Disseminate Prostate

  15. Dog Pelvic Tract Pelvic Urethral Muscle Prostate Bladder Vas Deferens Bulbospongiosus Muscle

  16. Cat (Tom) Reproductive Tract Cowper’s Gland Vas Deferens Prostate Corpus Cavernosum Glans Penis Crus Penis Ampulla

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

  18. Cat Glans Penis

  19. Feline Anatomy: Erection and Mating

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

  21. Accessory Gland Secretions Gel Gel Clot Enzyme Clot

  22. Penis Types Muscular-Vascular Fibroelastic

  23. Human Penis Cross Section

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

  25. Comparison of Penis Types

  26. Human

  27. Sigmoid Flexure Boar Bull Fibroelastic Penis

  28. Muscular-Vascular Penis Type Stallion

  29. The Penis

  30. 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

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

  32. Seminiferous Tubules

  33. Seminiferous Tubule

  34. Sertoli Cell Sertoli Cell

  35. Capillary Leydig Cell

  36. Capillary Leydig Cells

  37. Epididymis Basal Cell Stereo-Cillia Principal Cell

  38. Cauda Epididymis near Vas Deferens

  39. Sperm Smooth Muscle Vas Deferens

  40. Corpus Spongiosum Lumen Muscle Urethra

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