Themale reproductive systemconsists of a number ofsex organsthat play a role in the process ofhuman reproduction. These organs are located on the outside of the body and within thepelvis.Most species have two sexes: male and female. Each sex has its own unique reproductive system. They are different in shape and structure, but both are specifically designed to produce, nourish, and transport either the egg or sperm.Unlike the female, whose sex organs are located entirely within the pelvis, the male has reproductive organs, orgenitals, that are both inside and outside the pelvis. The male genitals include:

the testicles

the duct system, which is made up of the epididymis and the vas deferens

the accessory glands, which include the seminal vesicles and prostate gland

the penis

In a guy who's reached sexual maturity, the twotesticles(pronounced: TESS-tih-kulz), ortestes(pronounced: TESS-teez), produce and store millions of tiny sperm cells. The testicles are oval-shaped and grow to be about 2 inches (5 centimeters) in length and 1 inch (3 centimeters) in diameter.The testicles are also part of the endocrine system because they produce hormones, includingtestosterone(pronounced: tess-TOSS-tuh-rone). Testosterone is a major part of puberty in guys, and as a guy makes his way through puberty, his testicles produce more and more of it. Testosterone is the hormone that causes guys to develop deeper voices, bigger muscles, and body and facial hair, and it also stimulates the production of sperm.Alongside the testicles are theepididymis(pronounced: ep-uh-DID-uh-miss) and thevas deferens(pronounced: VAS DEF-uh-runz), which make up the duct system of the male reproductive organs. The vas deferens is a muscular tube that passes upward alongside the testicles and transports the sperm-containing fluid calledsemen(pronounced: SEE-mun). The epididymis is a set of coiled tubes (one for each testicle) that connects to the vas deferens.

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