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Animal / Dairy Science 434. Lec 4: Comparative Male Anatomy. 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

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Animal dairy science 434 l.jpg

Animal / Dairy Science 434

Lec 4: Comparative Male Anatomy


Testis l.jpg
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


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

Vertical


Slide6 l.jpg
Boar

Oblique


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Dog

Oblique


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Horizontal

Stallion


Human l.jpg
Human

Vertical


Testis orientation l.jpg
Testis Orientation

Bull

Tail

Head


Testis11 l.jpg
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


Slide13 l.jpg
Ram

SeminalVesicles

Pelvic Urethral Muscle

Cowper’sGland

Ampulla

Prostate

Bladder

Vas Deferens

BulbospongiosusMuscle

No Body of the Prostate


Slide14 l.jpg

Cowper’s Gland

SeminalVesicles

Prostate

No Ampulla

Large Cowper’s

Vas Deferens

BulbospongiosusMuscle

Pelvic Urethral Muscle


Slide15 l.jpg

Prostate

Cowper’s Gland

SeminalVesicles

Ampulla

BulbospongiosusMuscle

No Disseminate

Prostate

Pelvic Urethral Muscle

Vas Deferens


Human16 l.jpg
Human

No Disseminate

Prostate


Dog pelvic tract l.jpg
Dog Pelvic Tract

No Seminal Vesicles or Disseminate Prostate

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

No Seminal Vesicles or Disseminate Prostate


Cat tom reproductive tract20 l.jpg
Cat (Tom) Reproductive Tract

Note how close the cowper’s gland is to the penis in the cat.




Accessory glands l.jpg
Accessory Glands

Species Seminal Prostate Cowper's

Vesicles body disseminate

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

Blood Vessels

Corpus Cavernosum

Large Veins

Urethra

Corpus Spongiosum


Slide27 l.jpg

Internal

Prepuce

Urethral

Process

Stallion

Raphe

Bull

Glans

Penis

Free End of Penis

Human

Filiform

Appendage

Ram

Cat

Boar




Sigmoid flexure l.jpg
Sigmoid Flexure

Boar

Bull

Fibroelastic Penis




Erection and ejaculation characteristics l.jpg
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


Slide34 l.jpg

Sertoli Cells

Leydig Cells

Seminiferous

Tubule

Primary

Spermatocyte

Spermatogonium

  • Support spermatogenesis

Myoid Cells

Secondary

Spermatocyte

  • Testosterone synthesis

Round Spermatids

Spermatids

Basement

Membrane

Capillary




Slide37 l.jpg

Sertoli Cell

Sertoli Cell


Slide38 l.jpg

Interstitial Tissue (space)

Capillary

Leydig Cell


Slide39 l.jpg

Capillary

Leydig

Cells


Slide41 l.jpg

Epididymis

Basal Cell

Stereo-Cillia

Principal Cell



Slide43 l.jpg

Sperm

Smooth Muscle

Vas Deferens


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