1. Lec 3: Male Reproductive Tract Anatomy
Animal/Dairy Science 434
Lec 3:
Male Reproductive Tract Anatomy

2. Learning Objectives
To be able to describe the male reproductive system in the bull.
Structure
Function

3. 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 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

4. Bull Reproductive Tract

5. Reproductive Organs of the Bull

6. Reproductive Organs of the Bull
Testis
Primary Sex Organ

7. Bull Testis

8. Bull Tract
Thermosensor
Radiator
Protective sac
Scrotum

9. Bull Tract
Longitudinal Section
Cross Section

10. Scrotal Cross Section

11. Scrotal Longitudinal Section

12. Structure of the Testis
Seminiferous Tubule
Tunica Albuginea
Rete Testis
(within the mediastinum)

13. Mediastinum
Rete Testis
Seminiferous
Tubule
The Testis

14. Structure of the Testis
Seminiferous Tubule
Tunica Albuginea
Rete Testis
(within the mediastinum)

15. Structure of the Testis
Spermatic Cord
Secondary Sex Organs
Vas Deferens
Caput Epididymis
Vasectomy
Vas Efferentia
6-12 tubules
Corpus
Epididymis
Cauda Epididymis

16. 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

17. 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 ng T/ml

18. Testis Arterial Pulse Spermatic Artery Testicular Artery Pampiniform
Plexus
Testicular
Artery
Testicular
Artery

19. Spermatic Chord
Pampiniform
Plexus

20. Bull Tract
Tunica Dartos

21. Contraction of the Tunica Dartos
Testis
Tunica Dartos
Smooth muscle
Androgen dependent (Testosterone)

22. Bull Tract
Gubernaculum

23. Bull Tract
Pelvic Genitalia

24. Pelvic Genitalia of the Bull
Pelvic Urethra
Muscle

25. Bull

26. Bulb of the Penis

27. 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

28. Cross Section of Bull Penis

29. Penis Cross Section

30. Glans Penis of the Bull Free Part of Penis Urethral Process Raphe
Prepuce (Retracted)

31. Glans Penis Urethral Process Raphe Glans Penis Free Part of Penis
Prepuce (Retracted)

32. Arterial Supply

33. 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
Prepuce
Gubernaculum