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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Reproductive Organs of the Bull
Vertical
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Ram
Vertical
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Boar
Oblique
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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 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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Cowpers Gland
SeminalVesicles
Prostate
No Ampulla Large Cowpers
Vas Deferens
BulbospongiosusMuscle
Pelvic Urethral Muscle
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Prostate
Cowpers Gland
SeminalVesicles
Ampulla
BulbospongiosusMuscle
No Disseminate Prostate
Pelvic Urethral Muscle
Vas Deferens
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Human
No Disseminate Prostate
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Dog Pelvic Tract
Pelvic Urethral Muscle
No Seminal Vesicles or Disseminate Prostate
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
No Seminal Vesicles or Disseminate Prostate
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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
Blood Vessels
Corpus Cavernosum
Large Veins
Urethra
Corpus Spongiosum
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Internal Prepuce
Urethral Process
Stallion
Raphe
Bull
Glans Penis
Free End of 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 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
Spermatogonium

• 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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Interstitial Tissue (space)
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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