Animal/Dairy Science 434

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Animal/Dairy Science 434

• Lec 3
• Male Reproductive Tract Anatomy

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Male Reproductive System
LEARNING OBJECTIVES To learn the nomenclature
and structures of the male reproductive system.
To understand the functions of these structures
and how they are interrelated to prove the
complete reproductive process in the male.
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Testis
Epididymis

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

• Finishing School
• Fluid Absorption
• 8-25 X 109 sperm
• membrane changes
• nuclear flagellar stabilization
• motility, fertility
• cytoplasmic droplet translocation

Penis

• Delivery System
• Erection
• Protrusion
• Ejaculation

Tail of Epididymis

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

Accessory Sex Glands

• Alterations Packaging
• Metabolic substrates
• Surface coatings
• Transport for sperm

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Bull ReproductiveTract
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Reproductive Organs of the Bull
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Bull Testis

• Tunica Vaginalis
• parietal
• visceral

Tunica Albuginea
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Bull Tract

• Thermosensor
• Radiator
• Protective sac

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Scrotal Cross Section
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Testis
Testicular Parenchyma
Mediastinum
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Structure of the Testis
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The Testis
Mediastinum
Rete Testis
Seminiferous Tubule
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Structure of the Testis

• Vasectomy

Seminiferous Tubule
Tunica Albuginea
Rete Testis (within the mediastinum)
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Spermatic Chord
Pampiniform Plexus

• Vascular, lymphatic and nerves
• Heat exchanger
• Houses cremaster muscle

Testicular Artery

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

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Testis Arterial Pulse
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Spermatic Chord
Vas Deferens
Cremaster Muscle
Pampiniform Plexus
Parietal Tunica Vaginalis
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Bull Tract
Testis
Scrotum
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Contraction of the Tunica Dartos
Testis

• Tunica Dartos
• Smooth muscle
• Androgen dependent(Testosterone)

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Bull Tract
Pelvic Genitalia
Spermatic Chord
Pampiniform Plexus
Epididymus
Testis
Scrotum
Tunica Dartos
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Pelvic Genitalia of the Bull
Pelvic Urethra Muscle
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Bulb of the Penis
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Reproductive Organs of the Bull
Prostate
Rectum
Cowpers Gland
Seminal Vesicles
Ampulla
Bladder
Vas Deferens
Caput Epididymis
Glans Penis
Scrotum
Testis
Cauda Epididymis
Gubernaculum
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Cross Section of Bull Penis
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Penis Cross Section
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Arterial Supply
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Glans Penis
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Glans Penis