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}}</ref> The adult foreskin frequently has prominent visible veins.
The layer of [[dartos]] muscle is contained within the foreskin.<ref name="cold-taylor1999 /> The dartos muscle keeps the foreskin snugly against the glans. The fibers of the dartos muscle form a whorl at the tip that functions as a sphincter. The sphincter opens to allow [[urine ]] to flow out, but closes to protect the penis from foreign matter, contaminants, and pathogens.<ref name="lakshmanan-prakash1980"/><ref>{{REFjournal
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