Lec 3: Male Reproductive Tract Anatomy Animal/Dairy Science 434 Lec 3: Male Reproductive Tract Anatomy
Male Reproductive System LEARNING OBJECTIVES: To learn the nomenclature and structures of the male reproductive system. To understand the functions of these structures and how they are interrelated to prove the complete reproductive process in the male.
Warehouse and Delivery 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
Bull Reproductive Tract
Reproductive Organs of the Bull Testis
Bull Testis Tunica Vaginalis parietal visceral Tunica Albuginea
Bull Tract Thermosensor Radiator Protective sac Testis Scrotum
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 Spermatic Cord Vas Deferens Caput Epididymis Vasectomy Vas Efferentia 6-12 tubules Seminiferous Tubule Corpus Epididymis Tunica Albuginea Rete Testis (within the mediastinum) Cauda Epididymis
Spermatic Chord Pampiniform Plexus Vascular, lymphatic and nerves 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
Parietal Tunica Vaginalis Spermatic Chord Vas Deferens Cremaster Muscle Pampiniform Plexus Parietal Tunica Vaginalis
Bull Tract Testis Scrotum Tunica Dartos
Contraction of the Tunica Dartos Testis Tunica Dartos Smooth muscle Androgen dependent (Testosterone)
Bull Tract Pelvic Genitalia Spermatic Chord Pampiniform Plexus Epididymus Testis Scrotum Tunica Dartos Gubernaculum
Pelvic Genitalia of the Bull Pelvic Urethra Muscle
Bulb of the Penis
Reproductive Organs of the Bull Prostate Reproductive Organs of the Bull Rectum Cowpers Gland Seminal Vesicles Ampulla Bladder Retractor Penis Muscle Vas Deferens Sigmoid Flexure Glans Penis Caput Epididymis Scrotum Testis Cauda Epididymis Gubernaculum
Cross Section of Bull Penis
Penis Cross Section
Arterial Supply
Glans Penis
Glans Penis