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

2. 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.

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
Testis

6. Bull Testis
Tunica Vaginalis
parietal
visceral
Tunica Albuginea

7. Bull Tract
Testis
Scrotum

8. Scrotal Cross Section
testicular parenchyma
mediastinum

9. Testis
Testicular Parenchyma
Mediastinum

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

11. Mediastinum
Rete Testis
Seminiferous
Tubule
The Testis

12. Structure of the Testis
Spermatic Cord
Vas Deferens
Caput Epididymis
Vas Efferentia
6-12 tubules
Seminiferous Tubule
Corpus
Epididymis
Tunica Albuginea
Rete Testis
(within the mediastinum)
Cauda Epididymis

13. Spermatic Chord
Pampiniform
Plexus
Testicular
Artery

14. 39°C
Pampiniform Plexus

15. Counter Current Exchange

16. Testis Arterial Pulse

17. Bull Tract
Testis
Scrotum
Tunica Dartos

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

19. Parietal Tunica Vaginalis
Spermatic Chord
Vas Deferens
Cremaster Muscle
Pampiniform Plexus
Parietal Tunica Vaginalis

20. Spermatic Chord

21. Bull Tract Pelvic Genitalia Spermatic Chord Pampiniform Plexus
Epididymus
Testis
Scrotum
Tunica Dartos
Gubernaculum

22. Pelvic Genitalia of the Bull
Pelvic Urethra
Muscle

24. Bulb of the Penis

25. 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

26. Cross Section of Bull Penis

27. Penis Cross Section DEC = dorsal erectile canals
CC = corpus cavernosum
U = urethra
CS = corpus spongiosum

28. Prepuce

29. Glans Penis

30. Glans Penis

31. Arterial Supply

32. Temperature Regulation of Testis
Pampiniform plexus
Muscle contractions
Tunica Dartos (smooth muscle)
sustained contractions
Cremaster (striated muscle)
only temporary contractions
primarly controls the pampiniform plexus
Scrotal sweating
Convection around scrotum
Polypnea (panting)

33. Thermoregulation of Testis

36. Tunica Dartos
Cremaster