An erection occurs as a result of change in the blood veins, muscles and nerves of the penis. In an erection the penis of a man becomes stiff and gets enlarged.
As the blood flows in and out of the penis the erections occurs.
The main parts of penis which are involved in erections are
Corpora Cavernosa: These are the cylindrical tissues attached to the penis, responsiblem for filling in the blood.
Tunica: Tough outer sheath around the corpora which limits the expansion of the corora.
Corpus Spongeosum: A cylinder of tissue between the two corporas. It contains the urethra which passes the semen and the urine.
How an erection occurs?
There are various physical and psychological activities associated which are responsible for the occurrence of penis erection. The flows of the erections are as follows:
- Some tender touch, scenes, sounds, fantasies make you sexually aroused.
- These gestures send the signal out from a part of the brain called para ventricular nucleus.
- These signals reach the spinal cord and to the corpora cavernosa and the arteries that fills in the penis with blood.
- The fibres in the corpora thus relax and let the blood fill in.
- The increased blood flow further expands the sheath of the penis.
- As the sheath of the penis gets stretched it prevents the other veins to take off the blood from there. Thus the blood gets trapped in the penis which increases the pressure inside the penis and as a result penis becomes erect.
- During an erection the pressure of blood in the penis becomes twice to its original circulation.
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