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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. Stallion

  7. Human

  8. Testis Orientation Bull Tail Head

  9. 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

  10. Ram No Body of the Prostate

  11. No Ampulla Large Cowper’s

  12. No Disseminate Prostate

  13. Human No Disseminate Prostate

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

  15. Accessory Gland Secretions Gel Gel Clot Enzyme Clot

  16. Penis Types Muscular-Vascular Fibroelastic

  17. Human Penis Cross Section

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

  19. Comparison of Penis Types

  20. Human

  21. Sigmoid Flexure Boar Bull Fibroelastic Penis

  22. Muscular-Vascular Penis Type Stallion

  23. The Penis

  24. 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

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

  26. Seminiferous Tubules

  27. Seminiferous Tubule

  28. Sertoli Cell Sertoli Cell

  29. Capillary Leydig Cell

  30. Capillary Leydig Cells

  31. Epididymis Basal Cell Stereo-Cillia Principal Cell

  32. Cauda Epididymis near Vas Deferens

  33. Sperm Smooth Muscle Vas Deferens

  34. Corpus Spongiosum Lumen Muscle Urethra

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