Transcript Bull Reproductive Tract - University of Wisconsin

Animal/Dairy Science 434
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
Primary Sex Organ
Testis
Bull Testis
Bull Tract
•
•
•
Thermosensor
Radiator
Protective sac
Scrotum
Bull Tract
Longitudinal Section
Cross Section
Scrotal Cross Section
Scrotal
Longitudinal
Section
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
Spermatic Cord
Secondary Sex Organs
Caput Epididymis
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
Artery
Pampiniform
Plexus
Testicular
Artery
Testicular
Artery
Spermatic Chord
Pampiniform
Plexus
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
Bull
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
Glans Penis of the Bull
Free Part
of Penis
Urethral Process
Raphe
Prepuce (Retracted)
Glans Penis
Urethral
Process
Glans Penis
Glans Penis
Raphe
Free Part
of Penis
Prepuce (Retracted)
Arterial Supply
Reproductive
Organs of the
Bull
Rectum
Prostate
Cowpers
Gland
Seminal Vesicles
Ampulla
Bladder
Retractor
Penis
Muscle
Vas Deferens
Sigmoid
Flexure
Glans
Penis
Prepuce
Caput Epididymis
Scrotum
Testis
Gubernaculum
Cauda Epididymis