Male Reproductive System Jr/Sr Veterinary Science Animal Reproduction Male Reproductive System Jr/Sr Veterinary Science
Introduction Reproductive System: Responsible for producing offspring Theriogenology: Study of animal reproduction Function of Male Reproductive System: To produce & deliver sperm
Male Reproductive Structures Scrotum: external pouch that encloses testes, & regulates temperature Latin term for bag
Male Reproductive Structures Testes: primary reproductive gland: Produce sperm & hormones Orientation varies among species
Male Reproductive Structures Testes: Divided into compartments containing coiled tubes called seminiferous tubules
Male Reproductive Structures Within the testes there are Spermatozoa: Male Sex Cells
Male Reproductive Structures Epididymis: Tube where sperm matures. Is encased by the spermatic cord.
Male Reproductive Structures Seminiferous tubules: coiled tubes that contain sperm Cells of Leydig: Produces testosterone
Male Reproductive Structures Vas deferens: tube that transports sperm from epididymis to urethra At the end of the vas deferens is the ductus deferens
Male Reproductive Structures Urethra: carries sperm & urine to the penis, serves both the reproductive and urinary systems Urinary bladder: stores urine
Male Reproductive Structures Sigmoid flexure: “S” shaped bend in penis seen in ruminants and swine Retractor muscle: secures penis inside body
Male Reproductive Structures Accessory Sex Glands: Add secretions that nourish and protect sperm
Male Reproductive Structures Accessory Sex Glands: Seminal vesicles Prostate Gland Bulbourethral Gland
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
Male Reproductive Structures Semen: Fluid that contains sperm and secretions from accessory sex glands
Male Reproductive Structures Penis: Carries reproductive and urinary products out of body Composed of erectile tissue that fills with blood
Male Reproductive Structures Sheath: fold of skin that protects penis Also called prepuce or foreskin.
Bull: has a sigmoid flexure Species Differences Bull: has a sigmoid flexure Boar: corkscrew filiform appendage erection by straightening the sigmoid flexure
Male Reproductive Structures Ram: whip-like filiform appendage Stallion: lacks a sigmoid flexure
Male Reproductive Structures Dog: has an “os penis,” (bone encased in the penis)lacks some accessory sex glands
Male Reproductive Structures Tom Cat: barb-like filiform appendage Cat is the only specie to have a Cranioventricularly located penis
Sperm Male gamete, or “sex cell” Spermatogenesis: production of sperm Parts: Acrosome (cap), neck, tail or flagellum
Sperm Evaluation: (microscope) Motility: Ability to move Morphology: Shape Mortality: Number dead
Male Hormones GnRH: Stimulates production of LH & FSH LH: Stimulates production of testosterone
Male Hormones FSH: Testosterone: Produces sperm & secondary sex characteristics FSH: Stimulates seminiferous tubules to produce sperm
The End