Overview of the Male Anatomy
The following is an overview of the male reproductive anatomy:
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Scrotum. The bag of skin that holds and helps to protect the testicles. The testicles make sperm and, to do this, the temperature of the testicles needs to be cooler than the inside of the body. This is why the scrotum is located outside of the body.
Testes (testicles). The testes are 2 small organs that are found inside the scrotum. The testes are responsible for making sperm and are also involved in producing a hormone called testosterone. Testosterone is an important hormone during male development and maturation for developing muscles, deepening the voice, and growing body hair.
Epididymis. A long tube that is located near each testicle. The epididymis is the tube which moves the sperm from the testicles.
Vas deferens. This is a tube in which the sperm is stored and it carries the sperm out of the scrotal sac. The vas deferens is between the epididymis and the urethra and connects these together.
Seminal vesicles. The sac-like glands that lie behind the bladder and release a fluid that forms part of semen.
Prostate gland. It is about the size of a walnut, and surrounds the neck of the bladder and urethra—the tube that carries urine from the bladder. It is partly muscular and partly glandular with ducts opening into the prostatic portion of the urethra. It is made up of 3 lobes: a center lobe with 1 lobe on each side. The prostate gland secretes a slightly alkaline fluid that forms part of the seminal fluid, a fluid that carries sperm.
Urethra. This is a tube that allows urine to flow outside the body. It is also the channel for semen to pass during ejaculation. The brain signals the bladder muscles to tighten. This squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra. When all the signals happen in the correct order, normal urination happens.
Penis. The external reproductive organ of the male. The penis is made up of 2 parts, the shaft and the glans. The glans is the tip of the penis, while the shaft is the main part of the penis and contains the tube (urethra) that drains the bladder. All boys are born with a foreskin, or a covering over the tip of the penis. Some boys are circumcised. This means that this covering of skin is removed. Other boys are not circumcised and may have skin that covers the tip of the penis.
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