1. The Reproductive System
A Practical Guide
Unlike other animals, humans can CHOOSE when they want to reproduce.

2. Male Reproductive System
Seminal vesicle-semen
Ductus deferens-sperm duct
Prostate-semen
Urethra-urine
Penis
Epididymis-sperm maturation
Testis-sperm formation
Scrotum-cools testis

3. Scrotum
Sac of loose skin, fascia & smooth muscle divided into two pouches by a septum
*Temperature regulation of testes
*Sperm survival requires 2-3 degrees lower temperature than core body temperature
Muscle in scrotum
Elevates testes on exposure to cold & during arousal
Warmth reverses the process

4. Testosterone is responsible for many of the "male" characteristics.
Testes - make sperm via meiosis. The testes are also responsible for producing testosterone, the male hormone.
Testosterone is responsible for many of the "male" characteristics.
Septum
Lobule
Seminiferous tubule
Capsule

5. Spermatogenesis
*Spermatogenesis is the production of sperm by meiosis.
*Occurs in the seminiferous tubules in the testes.

6. (1) Spermatogonia are the Germ-Line cells. They are diploid (2n)
(1) Spermatogonia are the Germ-Line cells. They are diploid (2n). They undergo mitosis to reproduce themselves.
(2) One of these spermatogonia undergoes meiosis, and it is called a primary spermatocyte. It is diploid (2n).
(3) The primary spermatocyte undergoes MEIOSIS I to produce two secondary spermatocytes. These are now haploid (n) but still contain two chromatids per chromosome
(4) Each of these secondary spermatocytes undergoes MEIOSIS II to each produce two spermatids. Spermatids are haploid (n) and each contain 1 chromosome that was previously a chromatid. The result is 4 total spermatids.
(5) Spermatids mature into the sperm we know, and these sperm cells are called spermatozoa. They are then ready to leave the body and fertilize an egg!

7. Rete testes – carries sperm from seminiferous tubules to efferent ducts; sperm become concentrated and excess fluid reabsorbed; if this doesn’t occur, sperm may not concentrate and male may not be fertile
Epididymus - collects mature sperm which is eventually propelled through the vas deferens
Vas (ductus) deferens -sperm travel through this tube, joins with urethra  
Bulbourethral glands – produce lubricating fluid to cleanse urethra prior to ejaculation
Seminal vesicle – comprises most of sperm; contains fructose, sugary fluid that supplies energy for sperm to move

8. Anatomy of the sperm cell
Acrosome – the cap on top of the sperm cell that contains enzymes that help penetrate the egg membrane during fertilization

9. Vasectomy - the tube is cut to prevent sperm leaving (and fertilizing an egg)
This procedure can be done right in the doctor's office

10. New Reversible Vasectomy in Clinical Trials
See for full story and VIDEO!
"Das gathered a fold of skin, made a puncture, and reached into the scrotum with a fine pair of forceps. He extracted a white tube: the vas deferens, which sperm travel through from the testes to the penis. In a normal vasectomy, Das would have severed the vas, cauterized and tied up the ends, and tucked it all back inside. But rather than snipping, Das took another syringe, delicately slid the needle lengthwise into the vas, and slowly depressed the plunger, injecting a clear, viscous liquid. He then repeated the steps on the other side of the scrotum."
The procedure is RISUG (for reversible inhibition of sperm under guidance)
The substance that Das injected was a nontoxic polymer that forms a coating on the inside of the vas. As sperm flow past, they are chemically incapacitated, rendering them unable to fertilize an egg.

11. Circumcision
Boys are born with a hood of skin, called the foreskin, covering the head (also called the glans) of the penis. In circumcision, the foreskin is surgically removed, exposing the end of the penis.

12. See also: Kidshealth Male Reproductive
WORD BANK
Vas deferens
Bladder
Vas deferens
Scrotum
Urethra
Seminal Vesicle
Prostate
Urethra
Prostate
Epididymus
Epididymus
Bladder
Teste
Scrotum
Teste
Seminal Vesicle
See also: Kidshealth Male Reproductive

13. Male Reproductive Health
Recommended after age 50 - prostate exam
Doctors use the digital rectal exam (DRE) as a relatively simple test to check the prostate