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Lec 4: Comparative Male Anatomy
Animal / Dairy Science 434 Lec 4: Comparative Male Anatomy
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Testis Species Testis Wt. % Of Orientation (grams) Body Wt.
bull vertical ram vertical boar oblique stallion horizontal dog oblique rabbit vertical human vertical
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Reproductive Organs of the Bull
Prostate Reproductive Organs of the Bull Rectum Cowpers Gland Seminal Vesicles Ampulla Bladder Retractor Penis Muscle Vas Deferens Glans Penis Sigmoid Flexure Caput Epididymis Scrotum Prepuce Testis Cauda Epididymis Gubernaculum
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Reproductive Organs of the Bull
Vertical
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Vertical Ram
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Oblique Boar
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Dog Oblique
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Horizontal Stallion
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Human Vertical
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Testis Orientation Bull Tail Head
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Testis Species Testis Wt. % Of Orientation (grams) Body Wt.
bull vertical ram vertical boar oblique stallion horizontal dog oblique rabbit vertical human vertical
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Pelvic Urethral Muscle Bulbospongiosus Muscle
Seminal Vesicles Ram Pelvic Urethral Muscle Cowper’s Gland Ampulla Prostate Bladder Vas Deferens Bulbospongiosus Muscle No Body of the Prostate
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Bulbospongiosus Muscle Pelvic Urethral Muscle
Cowper’s Gland Seminal Vesicles Prostate No Ampulla Large Cowper’s Vas Deferens Bulbospongiosus Muscle Pelvic Urethral Muscle
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Bulbospongiosus Muscle Pelvic Urethral Muscle
Prostate Cowper’s Gland Seminal Vesicles Ampulla Bulbospongiosus Muscle No Disseminate Prostate Pelvic Urethral Muscle Vas Deferens
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Human No Disseminate Prostate
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Pelvic Urethral Muscle
Dog Pelvic Tract No Seminal Vesicles or Disseminate Prostate Pelvic Urethral Muscle Prostate Bladder Vas Deferens Bulbospongiosus Muscle
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Cat (Tom) Reproductive Tract
Cowper’s Gland Vas Deferens Prostate Corpus Cavernosum Glans Penis Crus Penis Ampulla No Seminal Vesicles or Disseminate Prostate
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Cat (Tom) Reproductive Tract
Note how close the cowper’s gland is to the penis in the cat.
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Cat Glans Penis
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Feline Anatomy: Erection and Mating
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Accessory Glands Species Seminal Prostate Cowper's
Vesicles body disseminate bull ram boar stallion (+) + dog Cat human
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Accessory Gland Secretions
Gel Clot Clot Enzyme
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Penis Types Muscular-Vascular Fibroelastic
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Human Penis Cross Section
Blood Vessels Corpus Cavernosum Large Veins Urethra Corpus Spongiosum
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Stallion Bull Human Ram Cat Boar Internal Urethral Prepuce Raphe
Process Stallion Raphe Bull Free End of Penis Glans Penis Human Filiform Appendage Ram Cat Boar
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Comparison of Penis Types
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Human
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Sigmoid Flexure Boar Bull Fibroelastic Penis
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Muscular-Vascular Penis Type
Stallion
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The Penis
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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
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Seminiferous Tubule Primary Spermatocyte Spermatogonium Sertoli Cells
Support spermatogenesis Myoid Cells Secondary Spermatocyte Leydig Cells Testosterone synthesis Round Spermatids Spermatids Basement Membrane Capillary
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Seminiferous Tubules
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Seminiferous Tubule
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Sertoli Cell Sertoli Cell
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Interstitial Tissue (space)
Capillary Leydig Cell
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Capillary Leydig Cells
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Epididymis Principal Cell Basal Cell Stereo-Cillia
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Cauda Epididymis near Vas Deferens
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Sperm Smooth Muscle Vas Deferens
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