1. Male Anatomy
© Robert J. Atkins, Ph.D.

3. Penis

4. How do people alter their genitals?
Piercings
Tattoos
Circumcision
Surgical penile enlargement

5. Piercing
Prince Albert

6. Piercing
Ladder

7. Tattoos

8. Circumcision
Egyptian

9. Why is cleaning foreskin helpful?
Pull back foreskin
Remove smegma
Avoids smegma build-up

10. How is the penis constructed?

11. What are the three cylinders?
2 larger cavernous bodies
1 smaller spongy body
Forms head of the penis

12. Penis- spongy body

13. Penis dissection

14. What is the most sensitive parts of the penis?
Coronal ridge
Frenulum

15. Penis, prostate dissection

16. Do you remember? Why is cleaning an uncircumcised foreskin helpful?
How is the penis constructed?
What are the three cylinders?
What are the most sensitive parts of the penis?

17. What about penis size? Not related to sexual satisfaction
Possibly diameter rather than length
Small flaccid penis usually increases more during erection than larger flaccid penis

18. What is the average penis size?
5 ½ - 6 “

19. How does the penis compare to the vagina in size?

20. Penis enlargement

21. Penis enlargement

22. Penis cones

23. How much does penis size vary?

24. Penis size variations(larger)

25. Penis size variations (smaller – Micro-penis)

26. What is penis augmentation surgery?
Done by cutting the ligaments that attach the root to the pubic bone.
Not recommended

27. Penis enlargement results
Before
After

28. What causes the scrotum to move closer to the body?
Sexual arousal
Cold temperatures
Fear
Stroking inner thighs
Cremasteric reflex
Cremasteric muscle

29. What about the testes? Asymmetrical Heat reduces sperm production
Left usually lower
Heat reduces sperm production
Best at 93 degrees

30. Do you remember?
Does a small flaccid penis, and a large flaccid penis enlarge equally during erection?
What is done in penis enlargement surgery?
What causes the scrotum to move closer to the body?
What can you tell me about the testes?

31. What is cryptorchidism?
Undescended testis
Prevents sperm production - too warm

32. What are the Seminiferous tubules?
Site of sperm production
Interstitial (Leydig’s) cells produce androgens
Sperm = 1% of semen

33. Seminiferous tubules

34. What does the epididymis do?
Storage of sperm

35. What do the Vas Deferens do?
Moves sperm from scrotum to ejaculatory duct
Within prostate gland

36. Do you remember? What is cryptorchidism?
What are the seminiferous tubules?
What does the epididymis do?
What do the vas deferens do?

37. What are the seminal vesicles?
At end of each vas deferens
Alkaline fluid
Major portioin of seminal fluid

38. What is the difference between sperm and semen?
Semen (What comes out)
70% = Seminal vesicles
30% = Prostate gland
1% = Sperm
1 teaspoon
million sperm per ejaculation
Sperm

39. Prostate gland
Some semen contribution

40. Cowpers (bulbourethral) glands
Distilate of love
May contain active, healthy sperm
Can produce pregnancy without ejaculation

41. What is the course of sperm?
Testes
Epididymis
Vas Deferens
Seminal vesicles
Urethra

42. What causes erections? Process of tumescence Nighttime erections
Related to
REM sleep
Rapid eye movement
90 minute cycle
Not related to a full bladder

43. Do you remember? What do the seminal vesicles do?
What is the difference between sperm and semen?
What may the cowpers gland contain?
What is the course of the sperm?
What causes nighttime erections?

44. What are the stages of ejaculation?
2 phases
Emission
Fluid in ejaculatory duct
Expulsion
Semen expelled
Dry orgasm
Before puberty

45. What is retrograde ejaculation?
Semen expelled into bladder
May result from
Prostate surgery
Certain drugs
Congenital abnormality

46. What can you tell me about testicular cancer?
One of the most common cancers among young men age group
Survival rate very high if detected early
Genital self-exam recommended
To identify early symptoms
Lumps on testes

47. Do you remember? What are the stages of ejaculation?
What is retrograde ejaculation?
Why is a genital self-exam recommended?

48. What problems does the prostate cause?
Prostate cancer
Second leading cause of cancer deaths in men
Prostate enlargement

49. How can you detect prostate cancer?
Detected by
Digital rectal exam (DRE)
Blood test – Prostate Specific Antigen test
(PSA test)
Ultrasound
Digital exam

50. Do you remember? What problems do the prostate cause?
How can you detect prostate cancer?