1. Chapter Four Male Anatomy, Physiology, and Sexual Response

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

3. 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.

4. 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.

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

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

7. 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

8. 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.

9. 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.