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→The protective and hygienic function of the foreskin: Wikify.
|pages=387-9
|accessdate=2019-10-20
}}</ref> The [[preputial cavity sac]] is sealed by the synechia so it cannot be infected.
In infancy, the foreskin's tubular neck (prepucial orifice) is often long and narrow while the sphincter muscle in the tip of the [[foreskin]] keeps its opening closed. This acts as an extension of the [[urethra]].<ref>{{REFjournal