Chapter Four Male Anatomy, Physiology, and Sexual Response

Male External Anatomy and Physiology - 1 Male Reproductive Anatomy, Side View

Male External Anatomy and Physiology - 2 Penis The primary male external sex organ, which, in the unaroused state, is soft and hangs between the legs. Scrotum The sac located below the penis that contains the testicles.

Circumcision Circumcision is surgical removal of the foreskin. The procedure is a religious or cultural rite in some societies. Funding the procedure is controversial in some areas.

Male Internal Anatomy and Physiology - 1 Male Internal Reproductive System, Posterior View

Male Internal Anatomy and Physiology - 2 Cross-Section of Testicle

Male Internal Anatomy and Physiology - 3 Testes Male gonads that develop from the same embryonic tissue as the the ovaries and produce spermatozoa and male hormones (Also called testicles) Personal Choices: Timing of Testicular Self-Exam Testicular cancer is the most common form of cancer in young men. The key is early diagnosis and treatment. Duct System Seminiferous tubules Epididymis Vas deferens

Male Internal Anatomy and Physiology - 4 Seminal Vesicles Secrete fluids that mix with sperm to become semen Prostate Gland Produces much of the seminal fluid Personal Choices: Timing of Prostate Rectal Exam The most common type of nonskin cancer in U.S. men is prostate cancer. More than 80% of all prostate cancers are diagnosed in men over the age of 65.

Sexual Response Cycle in Men Masters and Johnson’s Four-Stage Model of Sexual Response Excitement: Physiological changes including an erection. Plateau: Additional physiological changes including testicular enlargement and a “sex flush.” Orgasm: Release of tension including emission and expulsion of semen. Resolution: Physiological responses return to normal and the testes and scrotum shrink.