Learn About The Penis

The penis is part of the male reproductive or sexual system, which includes the scrotum and testicles. In order to understand how the penis works, it can help to think of it in two parts – the outside (what you can visibly see) and the inside (what you cannot see with the naked eye).

 

On the outside, the shaft of the penis is covered by a thin layer of skin, which is loose when unaroused or flaccid. Running through the middle of the penis is the urethra, a tube which comes to the end at the top of the head, or ‘glans penis’, where a slit-like vertical opening can be seen. Essentially, the urethra connects the bladder and the prostate gland with the end of the penis and its role is twofold: not only does it transport urine out of the body, it is also how semen travels to the end of the penis. As a result, the urethra plays an important role in men’s sexual health.

 

The internal sphincter, a muscle located at the base of the bladder, stops urine and semen from leaving the penis at the same time. When an orgasm occurs, the muscle shuts tightly to prevent urine from passing through the urethra at the same time, and to prevent sperm from passing ‘backwards’ into the bladder.

 

Human anatomy of the penis (To obtain copyright permission).

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