1. Male Reproductive System Jr/Sr Veterinary Science
Animal Reproduction
Male Reproductive System
Jr/Sr Veterinary Science

2. Introduction Reproductive System: Responsible for producing offspring
Theriogenology:
Study of animal reproduction
Function of Male Reproductive System:
To produce & deliver sperm

3. Male Reproductive Structures
Scrotum: external pouch that encloses testes, & regulates temperature
Latin term for bag

4. Male Reproductive Structures
Testes: primary reproductive gland: Produce sperm & hormones
Orientation varies among species

5. Male Reproductive Structures
Testes:
Divided into compartments containing coiled tubes called seminiferous tubules

6. Male Reproductive Structures
Within the testes there are
Spermatozoa:
Male Sex Cells

7. Male Reproductive Structures
Epididymis: Tube where sperm matures. Is encased by the spermatic cord.

8. Male Reproductive Structures
Seminiferous tubules: coiled tubes that contain sperm
Cells of Leydig: Produces testosterone

9. Male Reproductive Structures
Vas deferens: tube that transports sperm from epididymis to urethra
At the end of the vas deferens is the ductus deferens

10. Male Reproductive Structures
Urethra:
carries sperm & urine to the penis, serves both the reproductive and urinary systems
Urinary bladder: stores urine

11. Male Reproductive Structures
Sigmoid flexure: “S” shaped bend in penis seen in ruminants and swine
Retractor muscle: secures penis inside body

12. Male Reproductive Structures
Accessory Sex Glands:
Add secretions that nourish and protect sperm

13. Male Reproductive Structures
Accessory Sex Glands:
Seminal vesicles
Prostate Gland
Bulbourethral Gland

14. Male Reproductive Structures
Accessory Sex Glands:
Not all present in all species
Add secretions to semen
Flush urine from the urethra before sperm enters it.
Vagina very acidic

15. Male Reproductive Structures
Semen:
Fluid that contains sperm and secretions from accessory sex glands

16. Male Reproductive Structures
Penis: Carries reproductive and urinary products out of body
Composed of erectile tissue that fills with blood

17. Male Reproductive Structures
Sheath: fold of skin that protects penis
Also called prepuce or foreskin.

18. Bull: has a sigmoid flexure
Species Differences
Bull: has a sigmoid flexure
Boar: corkscrew filiform appendage erection by straightening the sigmoid flexure

19. Male Reproductive Structures
Ram: whip-like filiform appendage
Stallion: lacks a sigmoid flexure

20. Male Reproductive Structures
Dog: has an “os penis,” (bone encased in the penis)lacks some accessory sex glands

21. Male Reproductive Structures
Tom Cat: barb-like filiform appendage
Cat is the only specie to have a
Cranioventricularly located penis

22. Sperm Male gamete, or “sex cell” Spermatogenesis: production of sperm
Parts: Acrosome (cap), neck, tail or flagellum

23. Sperm Evaluation: (microscope) Motility: Ability to move
Morphology: Shape
Mortality: Number dead

24. Male Hormones
GnRH:
Stimulates production of LH & FSH
LH:
Stimulates production of testosterone

25. Male Hormones FSH: Testosterone:
Produces sperm & secondary sex characteristics
FSH:
Stimulates seminiferous tubules to produce sperm

26. The End