Spermatic Duct

spermatic duct spermatic duct

Testicles
Testes
Epididymis
Vas Deferens
Seminal Vesicles
Prostate Gland
Bulbourethral Glands
Semen
Urethra

Amazing Facts
Related Links

Testicles

Comprised of the testes and the epididymis

Testes (The Male Gonads)

Functions
Reproduction of sperm
Secretion of testosterone and other steroid hormones (sexual hormones)

Self Examination for testicular cancer
Testicular cancer is one of the most common cancers in men between the ages 15 and 35. Early detection ensures survival in almost 100% of men with the most common form of testicular cancer. For all types of testicular cancer there is a 78 to 85% five-year survival rate. Once you're well into puberty generally between ages 13 and 15 it is important to examine your testicles once a month. Make sure to read our testicular exam page.

Epididymis

A highly coiled tube lying against the upper back side of each teste.
Functions:
Storage of immature sperm until they reach maturity, which takes about 20 days after entering the epididymis. Once each sperm reaches maturity it enters the vas deferens.

Vas Deferens (Ductus Deferens)

Two 18" long tubes beginning at the epididymis of each testicle and joining the urethra within the prostate gland.
Functions:
Storage of sperm prior to ejaculation
Transport of sperm from the epididymis to the urethra

Seminal Vesicles

Two finger-length glands, lying behind the bladder, that produce a secretion that makes up 60% of your semen.
Function:
This secretion activates the sperm and supplies a sugar called fructose that the sperm use for energy;
"Sperm fuel!"

Prostate Gland

A walnut-sized gland, surrounding the urethra just below the bladder. Produces secretions that make up 30% of semen.
Function:
These secretions activate the sperm and protect the sperm by reducing the acidity of the vagina.

Bulbourethral Glands (Cowper's Glands)

Two pea-sized glands in males just below the prostate that secrete a clear fluid into the urethra prior to ejaculation.
Function:
Reduces the acidity of the urethra
Provides lubrication on the tip of the glans penis prior to ejaculation (This is the stuff you see on the tip of your penis sometimes before having sex) Be careful: If you've ejaculated recently, this drop of lubrication could contain thousands of sperms ready to fertilize an egg. Keep your penis away from the vagina until you're covered up with a condom.

Semen

A mixture containing sperm and the nutrients and chemicals that activate and fuel sperm while protecting them from the hostile environment they will encounter.

Urethra

Tube running from the bladder to the end of the penis
Functions:
Muscles around the base of the urethra contract during ejaculation to force semen through the urethra and out the urethral orifice at the tip of the penis.
Provides a tube through which urine leaves the bladder to exit out the urethral orifice.

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Amazing Facts

  • Over 8 million (8,388,608) (2 to the 23rd power) different combinations of maternal and paternal chromosomes can result during the formation of gametes.
  • Over 69,949,000,000,000 different combinations of chromosomes can result from fertilization.

Related Links

Male urogenital System

Male external genitalia

Female urogenital System

Female internal genitalia

Female external genitalia

Kidneys

Sexual issues