How does an Erection Occur?

The process of an erection is complex and intricate. The sequence of an erection starts with a stimulus, either physical or mental, that is received in the brain. The brain sends a signal through the nerves to the penis causing relaxation of the penile blood vessels. Relaxation of the blood vessels allows blood to flow into the penis. There is high pressure in the penis that traps the blood in the corpora carvenosum causing a sustained erection.  The corporus carvenosum is two parallel columns of erectile tissue that forms the body of the penis.

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