Chapter 5 print version

Chapter 5 print version - Chapter 5 Male Sexual Anatomy and...

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Chapter 5: Male Sexual Anatomy and Physiology The Male Sexual and Reproductive System 0. External Sex Organs 1. Internal Sex Organs 2. Other Sex Organs External Sex Organs 3. Boys are typically more comfortable with their genitalia than girls 0. Testes are visible (ovaries are internal) 1. Penis is typically held during urination 4. External sex organs 2. Penis 3. Scrotum The Penis 5. Contains urethra for urine and semen transport 6. Becomes erect to better penetrate the vagina and deposit sperm near the os 7. No bone, little muscle 8. Composed of 3 cylinders of erectile tissue 4. Corpora cavernosa (2) 5. Corpus spongiosum (contains the urethra) Internal structure of the penis (side view) Internal structure of the penis (cross section). The Glans Penis 9. The conelike end of the penis 6. Corona 7. Frenulum 8. Meatus 10. Sensitive to stimulation The Glans Penis 11. Foreskin is a fold of skin that can cover part or all of the glans; retracts over the corona during an erection
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12. Circumcision – surgical removal of the foreskin; most common male surgery in the U.S. 9. Religious/cultural ritual 10. Health reasons 11. Medical value is questionable The Root of the Penis 13. Extends into the body below the pubic bone 14. Attached to internal pelvic muscles and can be felt in the perineum The male reproductive organs. Erection 15. Any type of stimulation perceived as sexual can cause an erection; spinal reflex 16. Erection also occurs during REM, possibly to keep the penis supplied with blood 17. Nerve fibers open the arteries of the penis to allow blood to flow into the 3 cylinders 18. Veins compress to prevent exit of blood 19. Flaccid state returns when arteries constrict and the veins open to allow blood to flow out The Scrotum 20. Loose, wrinkled pouch beneath the penis containing the testicles 21. Lightly covered with pubic hair 22. Functions to keep the testicles 3°C cooler than the body’s temperature to keep sperm viable 12. Contains sweat glands 13. Cremaster muscle moves the scrotum closer to or farther from the body (protects) Internal Sex Organs 23. Testes 24. Epididymis 25. Vas deferens 26. Seminal vesicles 27. Prostate gland 28. Cowper’s glands The male reproductive organs.
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The Testicles 29. Two egg-shaped glands in the scrotum 30. 2 inches long, 1 inch diameter 31. Typically one (usually the left) hangs a bit lower to allow
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