Male Repro

-produce male sex hormones (testis) -develop male gametes (sperm) in the testis -the epididymis stores and concentrates the spermatozoa -deliver spermatozoa to the female system at the appropriate time

-found outside abdominal cavity in the scrotum in adults -spermatogenesis -hormone production

-sperm develop at temperatures < body temp -the cremaster muscle adjusts the location of the testes

cryptorchidism (testicle not ascended, typically only 1 testi)

Occurs in seminiferous tubules of testes -testis is like a ball of string-the seminiferous tubules is the string

-sertoli cells nourish developing spermatids -spermatozoa stored in epididymis as they mature -large numbers of spermatozoa constantly produced

-interstitial cells produce testosterone -responsible for development of secondary male sex characteristics -anabolic steroid hormone (protein building)

-head, midpiece and long narrow tail -acrosome: cap over the nucleus contains enzymes that help penetrate the ovum -midpiece: lots of mitochondria to produce energy for mobility

-contains the blood vessels, nerves and lymphatics and the vas deferens -the vas deferens is the tube that connects the testicle with the urethra

epididymis …… vas deferens……. urethra

seminal vesicles, prostate glands, bulbourethral gland

semen

1 prostate gland, 2 seminal vesicles, 2 bulbourethral (cowpers) gland

-contains the blood vessels, nerves and lymphatics and the vas deferens -the vas deferens is the tube that connects the testicle with the urethra

-fibroelastic penis- sigmoid flexure, straightens upon erection, allows for extension- bull ram, boar -Vascular- increased blood flow causes erection e.g. stallion