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!.