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Animal / Dairy Science 434 Testis Comparative Male Anatomy Species Testis Wt

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Animal / Dairy Science 434 Testis Comparative Male Anatomy Species Testis Wt Animal / Dairy Science 434 Testis Comparative Male Anatomy 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. cat --- --- oblique rabbit 2.5 .1 vertical human 25 .03 vertical Reproductive Organs of the Stallion Seminal Vesicles Prostate Rectum Reproductive Cowpers Seminal Vesicles Ampulla Gland Prostate Organs of the Ampulla Rectum Cowper’s Bull Bladder Bladder Gland Vas Deferens Retractor Vas Deferens Penis Retractor Glans Muscle Corpus Cavernosum Penis Penis Muscle Sigmoid Gubernaculum Flexure Cauda Caput Epididymis Caput Testis Scrotum Glans Penis Prepuce Scrotum Testis Cauda Epididymis Prepuce Gubernaculum Reproductive Organs of the Ram Bull Vertical Vertical Anatomy of the Dog Boar Oblique Oblique to Horizontal Stallion Human Vertical Horizontal Testis Orientation Testis Species Testis Wt. % Of Orientation Bull (grams) Body Wt. Tail Head bull 300+ .03 vertical ram 250 .3 vertical boar 350 .2 oblique stallion 200 .03 horizontal dog 25 .2 oblique/horz. cat --- --- oblique rabbit 2.5 .1 vertical human 25 .03 vertical The Stallion Pelvic Genitalia of the Stallion Bladder Seminal Cowper’s Body of Cowper’s Vesicles Gland Prostate Gland Bulbospongiosus Seminal Bulbospongiosus Muscle Vesicles Urethra Muscle Vas Ampulla Deferens Ampulla Crus Body of Penis Prostate Retractor Colliculus Seminalis Penis Muscle Pelvic Urethral Ischiocavernosus No Disseminate Muscle Vas Prostate Pelvic Urethral Muscle Deferens Muscle Seminal Ram Pelvic Vesicles Urethral Muscle Ampulla Cowper’s Gland Prostate Bladder Vas Bulbospongiosus Deferens Muscle No Body of the Prostate Human Seminal Cowper’s Gland Vesicles No Disseminate Prostate Prostate Vas No Ampulla Bulbospongiosus Deferens Large Cowper’s Muscle Pelvic Urethral Muscle Anatomy of the Dog Cat (Tom) Reproductive Tract Cowper’s Gland Vas Deferens Prostate Corpus Cavernosum Os Penis Crus Penis Glans Penis No ampulla, seminal vesicles, Ampulla disseminate prostate or Cowper’s gland No Seminal Vesicles or Disseminate Prostate Cat (Tom) Cat Glans Penis Reproductive Tract Note how close the cowper’s gland is to the penis in the cat. Feline Anatomy: Accessory Glands Erection and Species Seminal Prostate Cowper's Mating Vesicles body disseminate bull ++ + + + ram + - + ++ boar +++ + + +++ stallion +++ ++ - (+) + dog - ++ - - Cat - ++ - ++ human + ++ - + Penis Types Accessory Gland Secretions Muscular-Vascular Fibroelastic 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 Internal Urethral Human Penis Cross Section Raphe Prepuce Process Stallion Blood Vessels Corpus Cavernosum Bull Free End of Penis Glans Penis Muscular- Large Veins Vascular Human or Filiform Fibroelastic? Appendage Ram Cat Urethra Corpus Spongiosum Boar No picture Dog Comparison of Penis Types Human Semen Collection in the Dog Dog Anatomy Bulbus Glandis Canine Mating Canine Mating cont. Sigmoid Flexure Muscular- Vascular Penis Type Boar Bull Stallion Fibroelastic Penis The Penis Erection and Ejaculation Characteristics Species Sigmoid Type Erectile Glans Male Speed Ejac. Semen Sperm Sperm Flexure Tissue Erection Time Vol. Conc. Num. bull rapid short medium med.-high medium Bull yes FE + Glans Ram yes FE + Glans ram rapid short small high medium Boar yes FE + not distinct boar rapid long large low high Stallion no MV +++ Large Glans Dog no MV +++ Large Glans stallion slow moderate large low medium Cat no MV +++ Large Glans+ dog slow long large low low Spines Human no MV +++ Large Glans cat slow moderate small high low human slow moderate medium low low Dog – Os Penis Large Testes = high sperm numbers Large accessory glands = large volume of the ejaculate with lower concentration of sperm Seminiferous Tubule Primary Spermatocyte Spermatogonium Sertoli Cells Myoid Cells »Support spermatogenesis Secondary Spermatocyte Leydig Cells »Testosterone Round Spermatids synthesis Spermatids Basement Membrane Capillary Seminiferous Tubules Seminiferous Tubule Sertoli Cell Sertoli Cell Interstitial Tissue (space) Capillary Capillary Leydig Cells Leydig Cell Epididymis Principal Cell Basal Cell Stereo-Cillia Sperm Smooth Muscle Cauda Epididymis near Vas Deferens Vas Deferens .
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