Chapter 6 - Chapter 6 Male Sexual Anatomy and Physiology...

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Chapter 6: Male Sexual Anatomy and Physiology
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Chapter 6 Outline The Male Sexual and Reproductive System External Sex Organs Internal Sex Organs Other Sex Organs The Male Maturation Cycle Male Puberty Andropause
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Chapter 6 Outline (Cont.) Male Reproductive and Sexual Health Diseases of the Male Reproductive Organs Other Conditions that Affect the Male Reproductive Organs Cancer of the Male Reproductive Organs
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The Male Sexual and Reproductive System External Sex Organs Internal Sex Organs Other Sex Organs
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External Sex Organs Boys are typically more comfortable with their genitalia than girls Testes are visible (ovaries are internal) Penis is typically held during urination External sex organs Penis Scrotum
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The Penis Contains urethra for urine and semen transport Becomes erect to better penetrate the vagina and deposit sperm near the os No bone, little muscle Composed of 3 cylinders of erectile tissue Corpora cavernosa (2) Corpus spongiosum (contains the urethra)
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Figure 6.1 The internal structure of the penis.
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The Glans Penis The conelike end of the penis Corona Frenulum Meatus Sensitive to stimulation
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The Glans Penis (Cont.) Foreskin is a fold of skin that can cover part or all of the glans; retracts over the corona during an erection Circumcision – surgical removal of the foreskin; most common male surgery in the U.S. Religious/cultural ritual Health reasons Medical value is questionable
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The Root of the Penis Extends into the body below the pubic bone Attached to internal pelvic muscles and can be felt in the perineum
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Figure 6.2 The male reproductive organs.
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Erection Any type of stimulation perceived as sexual can cause an erection; spinal reflex Erection also occurs during REM, possibly to keep the penis supplied with blood Nerve fibers open the arteries of the penis to allow blood to flow into the 3 cylinders Veins compress to prevent exit of blood Flaccid state returns when arteries constrict and the veins open to allow blood to flow out
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The Scrotum Loose, wrinkled pouch beneath the penis containing the testicles Lightly covered with pubic hair Functions to keep the testicles 3°C cooler than the body’s temperature to keep sperm viable Contains sweat glands Cremaster muscle moves the scrotum closer to or farther from the body (protects)
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Internal Sex Organs Testes Epididymis Vas deferens Seminal vesicles Prostate gland Cowper’s glands
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