REPRODUCTIVE SYSTEM STRUCTURE and FUNCTION of MALE REPRODUCTIVE

REPRODUCTIVE SYSTEM STRUCTURE and FUNCTION of MALE REPRODUCTIVE

v. See Figure 21 -14 on pg. 460

TESTES AND EPIDIDYMIS v Testes • Found in scrotum • Size of small egg • Made up of 250 lobules, each with coiled seminiferous tubules v Epididymis • Collection of tubes above the testes • Connect the testes with the vas deferens v See Figure 21 -15 on pg. 460

VAS DEFERENS AND SCROTUM v Vas Deferens • Runs from epididymis to ejaculatory duct • Seminal vesicles connect to vas deferens • Ejaculatory duct connects vas deferens with urethra v Scrotum • Sac of skin that contains testes

PENIS, PROSTATE GLAND, AND BULBOURETHRAL GLANDS v Penis • Contains erectile tissue • End covered by foreskin – loose fitting skin v Prostate Gland • Surrounds beginning of urethra • Size and shape of chestnut v Bulbourethral glands • Located on either size of prostate below prostate

TESTES v Produce male gametes (spermatozoa) v Produce male sex hormone – testosterone v Inside, each lobule contains coiled seminiferous tubules where sperm develop v In embryo, testes formed in the abdomen and during the last 3 months, migrate into scrotum

v. Epididymis – where sperm are stored v. Vas Deferens – serves as a passageway for sperm from epididymis to ejaculatory duct v. Scrotum – serves as container for testes

PENIS v. Contains erectile tissue v. Organ of copulation v. Tip of penis covered with foreskin, which is often removed during circumcision

v Prostate Gland – secretes a fluid that enhances sperm motility and adds fluid to semen v Bulbourethral glands – add alkaline secretion to semen that helps sperm live longer v Infertility – lack of conception due to fallopian tube damage, low sperm count, hormone imbalance, and other disorders

ERECTION AND EJACULATION v Urethra has dual role: excretion of urine and to expel semen v Erection caused when erectile tissue fills with blood v Ejaculation expels semen v Impotence – unable to copulate (hold an erection)