animal / dairy science 434
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Animal / Dairy Science 434. Lec 4: Comparative Male Anatomy. Testis. SpeciesTestis Wt. % OfOrientation (grams) Body Wt. bull 300+.03 vertical ram 250.3 vertical boar 350.2 oblique stallion 200.03 horizontal dog 25.2 oblique - PowerPoint PPT PresentationTRANSCRIPT
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Animal / Dairy Science 434Animal / Dairy Science 434Lec 4: Comparative Male AnatomyLec 4: Comparative Male Anatomy
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TestisSpecies 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
Cowpers Gland
Caput Epididymis
Cauda EpididymisTestis
Scrotum
GlansPenis
Bladder
Ampulla
Seminal Vesicles
ProstateRectum
Vas Deferens
Gubernaculum
SigmoidFlexure
Retractor Penis
Muscle
Prepuce
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Ram
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Boar
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Stallion
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Human
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Testis Orientation
Tail Head
Bull
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TestisSpecies 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
No Body of the Prostate
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No AmpullaLarge Cowper’s
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No DisseminateProstate
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Human
No DisseminateProstate
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Accessory GlandsSpecies Seminal Prostate Cowper's
Vesicles body disseminate
bull ++ + + +
ram + - + ++
boar +++ + + +++
stallion +++ ++ - (+) +
dog - ++ - -
human + ++ - +
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Accessory Gland SecretionsSpecies Seminal
VesiclesProstate
Body+ DisseminateCowper’s
bull 30 6ram 8 6boar 30 40 30
stallion 30dog 70
human 70 25
GelGel
Clot Clot Enzyme
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Penis TypesMuscular-Vascular Fibroelastic
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Human Penis Cross Section
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InternalPrepuce Raphe
UrethralProcess
Free End of Penis
GlansPenis
FiliformAppendage
Bull
Ram
Boar
Stallion
Human
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Comparison of Penis Types
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Human
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Sigmoid Flexure
Bull
Boar
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 SpermErection Time Volume Conc. Number
bull rapid short medium medium- mediumhigh
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 numbersLarge accessory glands = large volume of the ejaculate with lower concentration of sperm
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»Support spermatogenesis
»Testosterone synthesis
PrimarySpermatocyte
Sertoli Cells
Leydig Cells
Capillary
BasementMembrane
Spermatids
Round Spermatids
SecondarySpermatocyte
Myoid Cells
SeminiferousTubule
SeminiferousTubule
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Seminiferous Tubules
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Seminiferous Tubule
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Sertoli CellSertoli Cell
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Leydig Cell
Capillary
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Capillary
LeydigCells
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Basal CellPrincipal Cell Stereo-Cillia
Epididymis
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Cauda Epididymis near Vas Deferens
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Vas Deferens
Smooth Muscle
Sperm
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Urethra
LumenLumen
MuscleMuscle
CorpusSpongiosum
CorpusSpongiosum