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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

Animal / Dairy Science 434

Lec 4: Comparative Male Anatomy

testis
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
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

slide5
Ram

Vertical

slide6
Boar

Oblique

slide7
Dog

Oblique

slide8

Horizontal

Stallion

human
Human

Vertical

testis orientation
Testis Orientation

Bull

Tail

Head

testis11
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
Ram

SeminalVesicles

Pelvic Urethral Muscle

Cowper’sGland

Ampulla

Prostate

Bladder

Vas Deferens

BulbospongiosusMuscle

No Body of the Prostate

slide14

Cowper’s Gland

SeminalVesicles

Prostate

No Ampulla

Large Cowper’s

Vas Deferens

BulbospongiosusMuscle

Pelvic Urethral Muscle

slide15

Prostate

Cowper’s Gland

SeminalVesicles

Ampulla

BulbospongiosusMuscle

No Disseminate

Prostate

Pelvic Urethral Muscle

Vas Deferens

human16
Human

No Disseminate

Prostate

dog pelvic tract
Dog Pelvic Tract

No Seminal Vesicles or Disseminate Prostate

Pelvic Urethral Muscle

Prostate

Bladder

Vas Deferens

Bulbospongiosus

Muscle

cat tom reproductive tract
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
Cat (Tom) Reproductive Tract

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

accessory glands
Accessory Glands

Species Seminal Prostate Cowper\'s

Vesicles body disseminate

bull ++ + + +

ram + - + ++

boar +++ + + +++

stallion +++ ++ - (+) +

dog - ++ - -

Cat - ++ - ++

human + ++ - +

accessory gland secretions
Accessory Gland Secretions

Gel

Gel

Clot Enzyme

Clot

penis types
Penis Types

Muscular-Vascular

Fibroelastic

human penis cross section
Human Penis Cross Section

Blood Vessels

Corpus Cavernosum

Large Veins

Urethra

Corpus Spongiosum

slide27

Internal

Prepuce

Urethral

Process

Stallion

Raphe

Bull

Glans

Penis

Free End of Penis

Human

Filiform

Appendage

Ram

Cat

Boar

sigmoid flexure
Sigmoid Flexure

Boar

Bull

Fibroelastic Penis

erection and ejaculation characteristics
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

Sertoli Cells

Leydig Cells

Seminiferous

Tubule

Primary

Spermatocyte

Spermatogonium

  • Support spermatogenesis

Myoid Cells

Secondary

Spermatocyte

  • Testosterone synthesis

Round Spermatids

Spermatids

Basement

Membrane

Capillary

slide37

Sertoli Cell

Sertoli Cell

slide38

Interstitial Tissue (space)

Capillary

Leydig Cell

slide39

Capillary

Leydig

Cells

slide41

Epididymis

Basal Cell

Stereo-Cillia

Principal Cell

slide43

Sperm

Smooth Muscle

Vas Deferens

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