1. Male Reproductive System

2. External Organs  1. Penis  Most prominent organ  Contains 3 canals of spongy, erectile tissue that fill with blood during sexual arousal (Erection)  Glans - Sensitive tip of the penis

3. External Organs: Scrotum  2. Scrotum (“man purse”)  Loose sac of skin that contains 2 testicles and a layer of smooth muscle.  When the scrotal muscle contracts, the scrotum wrinkles and the testicles are held close to the body for warmth.  When it relaxes, the scrotum hangs free to cool the testicles.  The scrotum keeps the testicles 5 degrees below body temp., which is necessary for sperm production.

4. What’s in a Name???  The word Testes, like its lexical cousin testimony, comes from the Latin word meaning to “witness.” In ancient Rome, it was customary for a man to hold his testicles when swearing an oath or giving evidence at a trial. If he was found to be lying, the authorities customarily cut off his testicles. Women having no testicles, were not allowed to testify.

5. It’s Baseball Season!!!

6. Internal Organs: Testicles  3. Testicles or Testes (sperm = rookie baseball players)  They produce sperm and testosterone- responsible for male secondary sexual characteristics like facial hair, body hair, broad shoulders and deepening of the voice.  Contain seminiferous tubules (very tiny tubes in which sperm are produced every 6 weeks)

7. Epididymis  4. Epididymis (Spring Training)  15-20 foot coiled tube that folds to make a “comma” shaped organ over each testicle  Stores sperm  Sperm spend several weeks in this tube maturing

8. Vas Deferens  5. Vas Deferens (I 95)  two 17 inch tubes that carries sperm from the epididymis up into the body before ejaculation (discharge of semen)

9. Seminal Vesicle  6. Seminal Vesicles (“Gatorade”)  2 pouches located just above & to each side of the prostate  Connected to the vas deferens produces a mucuslike fluid that mixes with the sperm.  This liquid is called seminal fluid provides nutrients for the sperm. (better swimmers) Sperm and all other fluids are collectively called semen.

10. Seminal Vesicle (cont)  Seminal fluid comprises 70% of semen.  Sperm: 200 million sperm per ejaculation.  If sperm count is between 60 million and 200 million, he is considered infertile  If less than 60 million, he is considered sterile

11. Prostate Gland  7. Prostate Gland (“cup” or batting helmet:“P” = protects  Size and shape of a golf ball, located just below the bladder  Makes fluid to neutralize the acid in the vagina, this fluid comprises about 30% of semen discharged  Vagina pH=2-4, sperm pH needs to be=6 “VAGINA BAD!!!” Acidic  Men 40-55 should have prostate examined periodically to rule out cancer  Men can have all or part of the prostate removed.

12. Cowper’s Glands  8. Cowper’s Glands (“grounds crew” “C” = clean)  2 pea sized glands located just below the prostate  Secretes pre-ejaculatory fluid that lubricates the urethra and neutralizes any acid that may remain after urination.  Small # of sperm may be present in this fluid (25% of the time)  THIS IS WHY THE WITHDRAWL DOES NOT WORK!!!!!!!

13. Urethra  9. Urethra  Carries urine from the bladder out of the penis; carries semen out of the penis.  Urine and semen do not travel through the urethra at the same time.  Males have sphincter muscles which close off the tube to the bladder prior to ejaculation.

14. Other Terms  Circumcision -  Surgical removal of the foreskin of the penis, done mostly for cosmetic reasons.  Some parents choose to have their baby boys circumcised for hygienic reasons even though it is not medically necessary.  In U.S. 60 % of boys are circumcised  Nocturnal emissions  “Wet Dreams”; uncontrolled ejaculations during sleep.  Review: Male Diagram Review: Male Diagram