The male reproductive system is made up of many different parts. Each of these body parts plays their own important role in the functioning of the body. Together, all of these parts produce, maintain, and transport sperm. The male reproductive system is also responsible for the production and secretion of male sex hormones. Everyone’s genitals are different, and like the rest of the body, it’s normal for genitals to be different shapes and sizes.

Male Reproductive Anatomy
External Male Reproductive Organs

Penis
The penis is a cylindrical shaped organ where urine and semen exit the body. The penis is made up of a sponge-like erectile tissue. This tissue allows the penis to fill up with blood and this is called an erection. Erections can be caused by arousal or even happen spontaneously for some boys during puberty.

Scrotum 
The scrotum is a pouch-like sac of skin that hangs behind the penis. A scrotum contains a male’s testicles. The purpose of the scrotum is to hold, protect, and regulate the temperature of the testicles. The scrotum has special muscles that allow the sac to move the testicles closer to the body for protection and warmth or farther away from the body to cool the internal temperature.

Testicles
Testicles (or testes) are two oval shaped organs in the scrotum. The testicles are secured in the scrotum by another bodily structure called the spermatic cord. Testicles are responsible for producing sperm and the male hormone testosterone. Testosterone is the hormone responsible for the changes a male may see during puberty, including body hair and a deeper voice.

Internal Male Reproductive Organs

Urethra
The urethra is a tube inside of the penis that carries semen and urine to the outside of the body.

Vas deferens
The vas deferens is a long, muscular tube that goes from the epididymis to the area behind the bladder. The purpose of this tube is the transport sperm to the urethra.

Seminal vesicles
The seminal vesicles are pouches that attach to the vas deferens and make seminal fluid, a sugar-rich fluid that provides sperm with energy and mobility.

Semen
Semen is the mixture of sperm and seminal fluid that comes out of the penis during ejaculation (when a male has an orgasm).

Sperm are made in the testicles and then move into the epididymis which is a long tube tightly coiled into the back of the scrotum. The sperm stay there for 2-3 months while they mature. Then they travel up into the body through a tube called the vas deferens. A male has two, one leading from each epididymis. The sperm travel through the vas deferens, past the bladder (where urine is stored), and into a tube called the urethra that will carry them out of the body.

Epididymis
The coiled tubes, behind the testicles, where sperm mature, and are stored.

Anus
The opening in the buttocks from which bowel movements come when a person
goes to the bathroom. It is part of the digestive system; it gets rid of body wastes.

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