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