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→Anatomy and function of the foreskin in detail: corrected the 20,000 nerve endings myth
<ref>Dr.med Wolfram Hartmann, Stellungnahme zur Anhörung am 26. November 2012 im Rechtsausschuss des Bundestages</ref>
The foreskin serves as a pathway for many significant veins. In addition the foreskin is saturated with roughly 20,000 very many nerve endings and tactile corpuscles, the same receptors that exist in the fingertips. The enormous density of nerves and mechanoreceptors make the foreskin the most sensitive part of the body, approximately 10 times more sensitive than the fingertips. This also distinguishes the human penis from those of other mammals, which in contrast have the main concentration of nerves in the glans, and not in the foreskin.
The two foreskin layers provide a skin reserve, into which the growing shaft expands during an erection. Depending to the individual length of a man's foreskin, it thereby retracts more or less far. In some men, the foreskin still fully covers the glans during an erection, in others the glans is partly or completely exposed.