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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 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 rabbit 2.5 .1 vertical human 25 .03 vertical
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
Testis Orientation Bull Tail Head
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
Ram SeminalVesicles Pelvic Urethral Muscle Cowper’sGland Ampulla Prostate Bladder Vas Deferens BulbospongiosusMuscle No Body of the Prostate
No Ampulla Large Cowper’s
No Disseminate Prostate
Human No Disseminate Prostate
Dog Pelvic Tract Pelvic Urethral Muscle Prostate Bladder Vas Deferens Bulbospongiosus Muscle
Cat (Tom) Reproductive Tract Cowper’s Gland Vas Deferens Prostate Corpus Cavernosum Glans Penis Crus Penis Ampulla
Cat (Tom) Reproductive Tract Note how close the cowper’s gland is to the penis in the cat.
Accessory Glands Species Seminal Prostate Cowper's Vesicles body disseminate bull ++ + + + ram + - + ++ boar +++ + + +++ stallion +++ ++ - (+) + dog - ++ - - Cat - ++ - ++ human + ++ - +
Accessory Gland Secretions Gel Gel Clot Enzyme Clot
Penis Types Muscular-Vascular Fibroelastic
Internal Prepuce Urethral Process Stallion Raphe Bull Glans Penis Free End of Penis Human Ram Filiform Appendage Cat Boar
Sigmoid Flexure Boar Bull Fibroelastic Penis
Muscular-Vascular Penis Type Stallion
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
Sertoli Cells Leydig Cells Seminiferous Tubule Primary Spermatocyte • Support spermatogenesis Myoid Cells Secondary Spermatocyte • Testosterone synthesis Round Spermatids Spermatids Basement Membrane Capillary
Sertoli Cell Sertoli Cell
Capillary Leydig Cell
Capillary Leydig Cells
Epididymis Basal Cell Stereo-Cillia Principal Cell
Sperm Smooth Muscle Vas Deferens
Corpus Spongiosum Lumen Muscle Urethra