FEMALE AND MALE REPRODUCTIVE SYSTEMS
MALE GENITAL ORGANS Internal Genital Organs External Genital Organs Testes Epididymis Ductus deferens Ejaculatory duct Accessory glands Seminal Vesicle Prostate Bulbourethral gland External Genital Organs Penis Scrotum
TESTES Paired oval glands located in scrotum 5 cm long and 3 cm in diameter Surrounded by dense white capsule (tunica albuginea)
250 lobules. 1 to 4 -seminiferous tubules Short efferent ducts exit the testes.
Seminiferous Tubules Seminiferous tubules contain Interstitial cells
Seminiferous tubule Straight tubule Rete testis Efferent duct Ductus Epididymis Ductus deferens
EPIDIDYMIS 6 meters maturation process
EPIDIDYMIS head body Tail
Duct System epididymis, ductus deferens, ejaculatory duct, and urethra.
Spermatic Cord contains the proximal ductus deferens, testicular artery and veins, lymph vessels, testicular nerve, cremaster muscle and a connective tissue covering.
Ejaculatory Duct Ampulla Each ejaculatory duct passes through the prostate gland and empties into the urethra.
Semen Mixture of sperms and seminal fluid 60% from seminal vesicles, 30% from prostate Slightly alkaline, milky appearance and sticky Contains nutrients, clotting proteins & an antibiotic to protect the sperms Typical ejaculate is 2.5 to 5 ml in volume Normal sperm count is 50 to 150 millions/mL Actions of many sperm are needed for one to enter If less than 20 millions/mL sterile
Scrotum skin and subcutaneous tissue septum dartos muscle cremaster muscle
PENIS is a cylindrical pendant organ located anterior to the scrotum and functions to transfer sperm to the vagina. consists of three columns of erectile tissue that are wrapped in connective tissue and covered with skin. The two dorsal columns are the corpora cavernosa. The single, midline ventral column surrounds the urethra and is called the corpus spongiosum. the male copulatory organ, is a cylindrical pendant organ located anterior to the scrotum and functions to transfer sperm to the vagina. consists of three columns of erectile tissue that are wrapped in connective tissue and covered with skin. The two dorsal columns are the corpora cavernosa. The single, midline ventral column surrounds the urethra and is called the corpus spongiosum.
Tunica albuginea Septum penis Trabecula corporum cavernosum/spongiosi Caverna corporum cavernosum/spongiosi
Erection Involves increase in length, width & firmness Changes in blood supply: arterioles dilate, veins constrict The spongy erectile tissue fills with blood Erectile Dysfunction [ED] also known as impotence
Emission and Ejaculation Muscle contractions close sphincter at base of bladder Fluids propelled through ductus deferens, seminal vesicles, & ejaculatory ducts into bulb of penis Prostatic fluid secreted into urethra Ejaculation Sympathetic nervous system reflex Skeletal muscles squeeze semen out through urethra