The anatomy of the penis is complex. It is comprised
primarily of two cylinders of sponge-like vascular
tissue that fill with blood to create an erection.
Blood is pumped into the penis under great pressure
and a series of valves keep it in the penis to
maintain the erection. A third cylinder is the
urethra, a tube that carries the urine and the
ejaculate. The knobby head of the penis is called
the glans. Blood flows to the penis by two very
small arteries that come from the Aorta. These
arteries are the same size as the arteries to
your finger. The main problem that causes impotence
is that the blood vessels become blocked and the
blood can not get to the penis. The other major
problem is leakage of blood from the penis into
the veins around the penis called a venous leak.
This is very common, similar to a hole in a tire.
The larger the hole the more air that needs to
be pumped into the tire to keep it hard!
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