Transcript Bull Reproductive Tract

Animal/Dairy Science 434
Lec 3:
Male Reproductive Tract Anatomy
Learning Objectives
• To be able to describe the male
reproductive system in the bull.
– Structure
– Function
Testis
Factory
• 1-25 X 109 sperm/day
• “Plant” must be air
conditioned
Penis
Delivery System
• Erection
• Protrusion
• Ejaculation
Epididymis
Finishing School
• Fluid Absorption
• 8-25 X 109 sperm
– membrane changes
– nuclear & flagellar
stabilization
– motility, fertility
– cytoplasmic droplet
translocation
Tail of Epididymis
Warehouse and Delivery
Accessory Sex Glands
Alterations & Packaging
• Metabolic substrates
• Surface coatings
• Transport for sperm
• Storage 10-50 X 109 sperm
• Sperm for 5-10 ejaculates
• Smooth muscle contractions
upon sexual stimulation
Bull
Reproductive
Tract
Reproductive
Organs of the
Bull
Reproductive
Organs of the
Bull
Testis
Bull Testis
Tunica Vaginalis
• parietal
• visceral
Tunica Albuginea
Bull Tract
•
•
•
Thermosensor
Radiator
Protective sac
Scrotum
Bull Tract
Longitudinal Section
Cross Section
Scrotal
Cross Section
testicular parenchyma
mediastinum
Testis
Testicular Parenchyma
Mediastinum
Structure of
the Testis
Seminiferous Tubule
Tunica Albuginea
Rete Testis
(within the mediastinum)
Mediastinum
Rete Testis
Seminiferous
Tubule
The Testis
Structure of
the Testis
Seminiferous Tubule
Tunica Albuginea
Rete Testis
(within the mediastinum)
Structure of
the Testis
Caput Epididymis
Spermatic Cord
Vas Deferens
• Vasectomy
Vas Efferentia
6-12 tubules
Corpus
Epididymis
Cauda Epididymis
Structure of
the Testis
Caput Epididymis
Spermatic Cord
Vas Deferens
• Vasectomy
Vas Efferentia
6-12 tubules
Seminiferous Tubule
Tunica Albuginea
Corpus
Epididymis
Rete Testis
(within the mediastinum)
Cauda Epididymis
Spermatic Chord
• Vascular, lymphatic and nerves
Pampiniform
Plexus
• Heat exchanger
• Houses cremaster muscle
Testicular
Artery
Pampiniform Plexus
• Counter Current Exchange
 39°C - 34°C
 70 ng T/ml - 4.8 ng T/ml
Testis Arterial
Pulse
Spermatic
Chord
Vas Deferens
Cremaster
Muscle
Pampiniform
Plexus
Parietal
Tunica
Vaginalis
Bull Tract
Tunica Dartos
Contraction of the Tunica Dartos
Testis
Tunica Dartos
• Smooth muscle
• Androgen dependent
(Testosterone)
Bull Tract
Gubernaculum
Bull Tract
Pelvic Genitalia
Pelvic Genitalia of the Bull
Pelvic Urethra
Muscle
Bulb of the Penis
Reproductive
Organs of the
Bull
Rectum
Prostate
Cowpers
Gland
Seminal Vesicles
Ampulla
Bladder
Retractor
Penis
Muscle
Vas Deferens
Sigmoid
Flexure
Glans
Penis
Caput Epididymis
Scrotum
Testis
Gubernaculum
Cauda Epididymis
Cross Section of Bull Penis
Penis Cross Section
Arterial Supply
Glans Penis
Glans Penis