Animal/Dairy Science 434

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Animal/Dairy Science 434

• Lec 3
• Male Reproductive Tract Anatomy

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Learning Objectives

• To be able to describe the male reproductive
  system in the bull.
• Structure
• Function

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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 Reproductive Tract
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Reproductive Organs of the Bull
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Reproductive Organs of the Bull
Primary Sex Organ
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Bull Testis
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Bull Tract

• Thermosensor
• Radiator
• Protective sac

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Bull Tract
Longitudinal Section
Cross Section
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Scrotal Cross Section
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Scrotal LongitudinalSection
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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
Seminiferous Tubule
Tunica Albuginea
Rete Testis (within the mediastinum)
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Structure of the Testis
Secondary Sex Organs

• Vasectomy

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Structure of the Testis

• Vasectomy

Seminiferous Tubule
Tunica Albuginea
Rete Testis (within the mediastinum)
Cauda Epididymis
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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
Pampiniform Plexus
Spermatic Artery
Testicular Artery
Testicular Artery
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Spermatic Chord
Pampiniform Plexus
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Bull Tract
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Contraction of the Tunica Dartos
Testis

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

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Bull Tract
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Bull Tract
Pelvic Genitalia
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Pelvic Genitalia of the Bull
Pelvic Urethra Muscle
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Bull
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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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Glans Penis of the Bull
Free Part of Penis
Urethral Process
Raphe
Glans Penis
Prepuce (Retracted)
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Glans Penis
Urethral Process
Raphe
Glans Penis
Free Part of Penis
Prepuce (Retracted)
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Arterial Supply
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Prostate
Reproductive Organs of the Bull
Rectum
Cowpers Gland
Seminal Vesicles
Ampulla
Bladder
Retractor Penis Muscle
Vas Deferens
Sigmoid Flexure
Caput Epididymis
Glans Penis
Scrotum
Testis
Cauda Epididymis
Prepuce
Gubernaculum