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The [[Ridged band|ridged band]] is a ring of deeply corrugated or ridged mucous membrane lining the tip of the prepuce. When the prepuce is retracted, the main part of the ridged band lies across the top and sides of the shaft of the penis. On the underside of the penis, the ridged band merges into the frenulum of the prepuce. Stretching of the accordion-like ridged band triggers important sexual reflexes and erogenous sensation.