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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

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Animal / Dairy Science 434

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Animal dairy science 434 l.jpg

Animal / Dairy Science 434

Lec 4: Comparative Male Anatomy


Testis l.jpg

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

rabbit 2.5.1 vertical

human 25.03 vertical


Reproductive organs of the bull l.jpg

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


Slide5 l.jpg

Boar


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Dog


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Rectum

Ampulla

Seminal Vesicles

Ureter

Prostate Gland

Vas Deferens

Cowper’s Gland

Spermatic Cord

Retractor Penis Muscle

Cauda Epididymis

Caput Epididymis

Gubernaculum

Corpus Epididymis

Glans Penis

Testis

Stallion


Human l.jpg

Human


Testis orientation l.jpg

Testis Orientation

Bull

Tail

Head


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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

rabbit 2.5.1 vertical

human 25.03 vertical


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Ram

SeminalVesicles

Pelvic Urethral Muscle

Cowper’sGland

Ampulla

Prostate

Bladder

Vas Deferens

BulbospongiosusMuscle

No Body of the Prostate


Slide13 l.jpg

No Ampulla

Large Cowper’s


Slide14 l.jpg

No Disseminate

Prostate


Human15 l.jpg

Human

No Disseminate

Prostate


Dog pelvic tract l.jpg

Dog Pelvic Tract

Pelvic Urethral Muscle

Prostate

Bladder

Vas Deferens

Bulbospongiosus

Muscle


Cat tom reproductive tract l.jpg

Cat (Tom) Reproductive Tract

Cowper’s Gland

Vas Deferens

Prostate

Corpus Cavernosum

Glans Penis

Crus Penis

Ampulla


Cat tom reproductive tract19 l.jpg

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

SpeciesSeminal ProstateCowper's

Vesiclesbodydisseminate

bull ++ + + +

ram + - + ++

boar +++ + ++++

stallion +++ ++ - (+) +

dog - ++ - -

Cat - ++ - ++

human + ++ - +


Accessory gland secretions l.jpg

Accessory Gland Secretions

Gel

Gel

Clot Enzyme

Clot


Penis types l.jpg

Penis Types

Muscular-Vascular

Fibroelastic


Human penis cross section l.jpg

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


Comparison of penis types l.jpg

Comparison of Penis Types


Human28 l.jpg

Human


Sigmoid flexure l.jpg

Sigmoid Flexure

Boar

Bull

Fibroelastic Penis


Muscular vascular penis type l.jpg

Muscular-Vascular Penis Type

Stallion


The penis l.jpg

The Penis


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Erection and Ejaculation Characteristics

SpeciesSpeed ofEjaculateSemenSpermSpermErectionTimeVolumeConc.Number

bullrapidshortmediummedium-mediumhigh

ramrapidshortsmallhighmedium

boarrapidlonglargelowhigh

stallionslowmoderatelargelowmedium

dogslowlonglargelowlow

humanslowmoderatemediumlowlow

Large Testes = high sperm numbers

Large accessory glands = large volume of the ejaculate with lower

concentration of sperm


Slide33 l.jpg

Sertoli Cells

Leydig Cells

Seminiferous

Tubule

Primary

Spermatocyte

  • Support spermatogenesis

Myoid Cells

Secondary

Spermatocyte

  • Testosterone synthesis

Round Spermatids

Spermatids

Basement

Membrane

Capillary


Slide34 l.jpg

Seminiferous Tubules


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Seminiferous Tubule


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Sertoli Cell

Sertoli Cell


Slide37 l.jpg

Capillary

Leydig Cell


Slide38 l.jpg

Capillary

Leydig

Cells


Slide40 l.jpg

Epididymis

Basal Cell

Stereo-Cillia

Principal Cell


Slide41 l.jpg

Cauda Epididymis near Vas Deferens


Slide42 l.jpg

Sperm

Smooth Muscle

Vas Deferens


Slide43 l.jpg

Corpus

Spongiosum

Lumen

Muscle

Urethra


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