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== Mechanism ==
 
== Mechanism ==
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Erection of the penis requires:
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* Elevated arterial inflow
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* Dilation of '''corporal sinusoids'''
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* Restricted venous outflow
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* Elevated intrapenile pressure
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* Relaxation of '''retractor penis muscles'''
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* Engorgement of cavernous sinuses causes a blockage of venous circulation from the penis.
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* Contractions of ischiocavernous muscles cause compression of the penile veins.
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** Intermittent contractions of the muscles around the two '''crura''' create a pump-like action at the base of the penis.
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** Result in the build up of blood within the '''corpus cavernosum'''.
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* Very high pressure results.
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== Vascular and Biochemical Control of Erection ==
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