Comparative Anatomy of Male Reproductive System
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The document provides a comparative analysis of male reproductive anatomy across various species, detailing testis weight, orientation, and associated reproductive organs. It includes observations on anatomy, gland presence, and specific characteristics of species such as bulls, rams, boars, stallions, dogs, cats, and humans. The text further discusses differences in sperm production, ejaculation speeds, and the role of accessory glands in reproduction.
Comparative Anatomy of Male Reproductive System
- 1. Animal / Dairy Science 434 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/horz. rabbit 2.5 .1 vertical human 25 .03 vertical
- 3. Reproductive Organs of the Bull Cowpers Gland Caput Epididymis Cauda EpididymisTestis Scrotum Glans Penis Bladder Ampulla Seminal Vesicles Prostate Rectum Vas Deferens Gubernaculum Sigmoid Flexure Retractor Penis Muscle Prepuce
- 5. Ram Vertical
- 6. Boar Oblique
- 7. Anatomy of the Dog Oblique to Horizontal
- 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/horizontal rabbit 2.5 .1 vertical human 25 .03 vertical
- 13. Ram No Body of the Prostate Ampulla Seminal Vesicles Prostate Bulbospongiosus Muscle Cowper’s Gland Bladder Vas Deferens Pelvic Urethral Muscle
- 14. No Ampulla Large Cowper’s Seminal Vesicles Bulbospongiosus Muscle Cowper’s Gland Vas Deferens Pelvic Urethral Muscle Prostate
- 15. No Disseminate Prostate Seminal Vesicles Bulbospongiosus Muscle Cowper’s Gland Vas Deferens Pelvic Urethral Muscle Prostate Ampulla
- 17. Anatomy of the Dog No ampulla, seminal vesicles, disseminate prostate or Cowper’s gland
- 18. Cat (Tom) Reproductive Tract Prostate Cowper’s Gland Glans Penis Corpus Cavernosum Crus Penis Vas Deferens Ampulla No Seminal Vesicles or Disseminate Prostate
- 19. Cat (Tom) Reproductive Tract Note how close the cowper’s gland is to the penis in the cat.
- 20. Cat Glans Penis
- 22. Accessory Glands Species Seminal Prostate Cowper's Vesicles body disseminate bull ++ + + + ram + - + ++ boar +++ + + +++ stallion +++ ++ - (+) + dog - ++ - - Cat - ++ - ++ human + ++ - +
- 23. Species Seminal Prostate Cowper's Vesicles Bull No Clot Material Ram No Clot Material Boar Gel Stallion Mucous Dog No Clot Material Human Clot Clot-Enzyme Accessory Gland Secretions
- 25. Human Penis Cross Section Corpus Cavernosum Corpus Spongiosum Urethra Blood Vessels Large VeinsMuscular- Vascular or Fibroelastic?
- 26. Internal Prepuce Raphe Urethral Process Free End of Penis Glans Penis Filiform Appendage Bull Ram Boar Stallion Human Cat DogNo picture
- 27. Comparison of Penis Types
- 28. Human
- 32. The Penis Species Sigmoid Type Erectile Glans Flexure Tissue Bull yes FE + Glans Ram yes FE + Glans Boar yes FE + not distinct Stallion no MV +++ Large Glans Dog no MV +++ Large Glans Cat no MV +++ Large Glans+ Spines Human no MV +++ Large Glans
- 33. Erection and Ejaculation Characteristics Male Speed Ejac. Semen Sperm Sperm Erection Time Vol. Conc. Num. bull rapid short medium med.-high medium ram rapid short small high medium boar rapid long large low high stallion slow moderate large low medium dog slow long large low low cat slow moderate small high 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
- 34. »Support spermatogenesis »Testosterone synthesis Primary Spermatocyte Sertoli Cells Leydig Cells Capillary Basement Membrane Spermatids Round Spermatids Secondary Spermatocyte Myoid Cells Seminiferous Tubule Spermatogonium
- 38. Leydig Cell Capillary Interstitial Tissue (space)
- 41. Basal CellPrincipal Cell Stereo-Cillia Epididymis
- 42. Cauda Epididymis near Vas Deferens