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Start innervation section.
The body of the penis consists of three cylindrical-shaped masses of erectile tissue which run the length of the penis. Two of the masses lie alongside each other and end behind the head of the penis. The third mass lies underneath them. This latter mass contains the [[urethra]]. The penis terminates in an oval or cone-shaped body, the [[glans penis]], which contains the exterior opening of the [[urethra]].<ref name="farlex2003" />
The [[glans penis]] is covered by a loose skin, the [[foreskin]] or prepuce, which enables it to expand freely during [[erection]]. The skin ends just behind the glans penis and folds forward to cover it, this forming the [[preputial sac]]. The inner surface of the foreskin contains glands that secrete a lubricating fluid that mixes with exfoliated tissue to form [[smegma]] which makes it easy for the penis to expand and retract past the [[foreskin]].
==Parts==
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== Innervation ==
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