Animal / Dairy Science 434

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Animal / Dairy Science 434

• Lec 4 Comparative Male Anatomy

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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
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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
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Ram
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Boar
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Dog
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Rectum
Ampulla
Seminal Vesicles
Ureter
Prostate Gland
Vas Deferens
Cowpers Gland
Spermatic Cord
Retractor Penis Muscle
Cauda Epididymis
Caput Epididymis
Gubernaculum
Corpus Epididymis
Glans Penis
Testis
Stallion
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Human
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Testis Orientation
Bull
Tail
Head
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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
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Ram
SeminalVesicles
Pelvic Urethral Muscle
CowpersGland
Ampulla
Prostate
Bladder
Vas Deferens
BulbospongiosusMuscle
No Body of the Prostate
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No Ampulla Large Cowpers
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No Disseminate Prostate
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Human
No Disseminate Prostate
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Dog Pelvic Tract
Pelvic Urethral Muscle
Prostate
Bladder
Vas Deferens
Bulbospongiosus Muscle
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Cat (Tom) Reproductive Tract
Cowpers Gland
Vas Deferens
Prostate
Corpus Cavernosum
Glans Penis
Crus Penis
Ampulla
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Cat (Tom) Reproductive Tract
Note how close the cowpers 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 Vesicl
es body disseminate bull
ram - boar
stallion
- () dog - -
- Cat - - human
-
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Accessory Gland Secretions
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Penis Types
Muscular-Vascular
Fibroelastic
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Human Penis Cross Section
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Internal Prepuce
Urethral Process
Stallion
Raphe
Bull
Glans Penis
Free End of Penis
Human
Ram
Filiform Appendage
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 Ere
ction Time Volume Conc. Number bull rapid short m
edium medium- medium high ram rapid short sma
ll high medium boar rapid long large low high st
allion slow moderate large low medium dog slow lo
ng large low low human slow moderate medium low lo
w
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

• Support spermatogenesis

Myoid Cells
Secondary Spermatocyte

• 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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Capillary
Leydig Cell
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Capillary
Leydig Cells
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Epididymis
Basal Cell
Stereo-Cillia
Principal Cell
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Cauda Epididymis near Vas Deferens
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Sperm
Smooth Muscle
Vas Deferens
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Corpus Spongiosum
Lumen
Muscle
Urethra