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Animal/Dairy Science 434Lec 3:

Male Reproductive Tract Anatomy

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Learning Objectives

To be able to describe the malereproductive system in the bull. Structure Function

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Factory 1-25 X 109sperm/day Plant must be air

conditioned

Factory 1-25 X 109sperm/day Plant must be air

conditioned

Warehouse and Delivery Storage 10-50 X 109sperm Sperm for 5-10 ejaculates Smooth muscle contractions

upon sexual stimulation

Warehouse and Delivery Storage 10-50 X 109sperm

Sperm for 5-10 ejaculates Smooth muscle contractions

upon sexual stimulation

Finishing School Fluid Absorption 8-25 X 109sperm

membrane changes nuclear & flagellar

stabilization motility, fertility cytoplasmic droplet

translocation

Finishing School Fluid Absorption 8-25 X 109sperm

membrane changes nuclear & flagellar

stabilization motility, fertility cytoplasmic droplet

translocationDelivery System

Erection Protrusion Ejaculation

Delivery System Erection Protrusion Ejaculation

Alterations & Packaging Metabolic substrates Surface coatings Transport for sperm

Alterations & Packaging Metabolic substrates Surface coatings

Transport for sperm

Testis Epididymis

Tail of Epididymis

Accessory Sex Glands

Penis

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BullReproductive

Tract

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ReproductiveOrgans of the

Bull

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ReproductiveOrgans of the

Bull

Testis

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Bull Testis

Tunica Vaginalis parietal

visceral

Tunica Albuginea

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Bull Tract

Scrotum

Thermosensor Radiator

Protective sac

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Bull Tract

Cross Section

Longitudinal Section

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ScrotalCross Section

testicular parenchyma

mediastinum

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Testis

Testicular Parenchyma

Mediastinum

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Structure ofthe Testis

Rete Testis

(within the mediastinum)

Tunica Albuginea

Seminiferous Tubule

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Mediastinum

SeminiferousTubule

Rete Testis

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Structure ofthe Testis

Rete Testis

(within the mediastinum)

Tunica Albuginea

Seminiferous Tubule

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Structure ofthe Testis

Vas Efferentia

6-12 tubules

a!ut E!idid"mis

auda E!idid"mis

or!us

E!idid"mis

Vas #eferens

S!ermatic ord

Vasectomy

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Structure ofthe Testis

Rete Testis

(within the mediastinum)

Tunica Albuginea

Vas Efferentia

6-12 tubules

a!ut E!idid"mis

auda E!idid"mis

or!us

E!idid"mis

Seminiferous Tubule

Vas #eferens

S!ermatic ord

Vasectomy

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$am!iniform

$le%us

TesticularArter"

Spermatic Chord

Pampiniform Plexus Counter Current Exchange 39C - 34C 70 ng T/ml - 4.8 ng T/ml

Vascular, lymphatic and nerves

Heat exchanger

Houses cremaster muscle

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Testis ArterialPulse

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Bull Tract

Tunica Dartos

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Contraction of the Tunica Dartos

Tunica Dartos

Smooth muscle

Androgen dependent(Testosterone)

Testis

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Bull Tract

Gubernaculum

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Bull Tract

Pelvic Genitalia

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Pelvic Genitalia of the Bull

Pelvic UrethraMuscle

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Bulb of the Penis

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ReproductiveOrgans of the

Bull

CowpersGland

Caput Epididymis

Cauda EpididymisTestis

ScrotumGlansPenis

Bladder

Ampulla

Seminal Vesicles

Prostate

Rectum

Vas Deferens

Gubernaculum

SigmoidFlexure

RetractorPenis

Muscle

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Cross Section of Bull Penis

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Arterial Supply

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Glans Penis

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