Foreskin
External

The outside of the foreskin is a continuation of the shaft skin of the penis and is covered by a keratinized stratified squamous epithelium. The inner foreskin is a continuation of the epithelium that covers the glans and is made up of glabrous squamous mucous membrane, like the inside of the eyelid or the mouth. The mucosal aspect of the prepuce has a great capacity for self-repair. The area of the outer foreskin measures 7–100 cm, and the inner foreskin measures 18–68 cm. The mucocutaneous zone occurs where the outer and inner foreskin meet. The foreskin is free to move after it separates from the glans, which usually occurs before or during puberty. The inner foreskin is attached to the glans by the frenulum, a highly vascularized tissue of the penis. The World Health Organization states that "the frenulum forms the interface between the outer and inner foreskin layers, and when the penis is not erect, it tightens to narrow the foreskin opening.
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