Changes

The foreskin (also known as the prepuce) is the double-layered fold of smooth muscle tissue, blood vessels, neurons, skin, and [[Preputial mucosa| mucous membrane]] part of the penis that covers and protects the [[glans penis]] and the urinary meatus.<ref name="cold-taylor1999"/> The adult foreskin measures about 3 inches by 5 inches or 15 square inches.<ref name="taylor1996">{{ColdCJ TaylorJR 1999REFjournal |last=Taylor |init=JR |author-link=John R. Taylor |last2=Lockwood |init2=AP |last3=Taylor |init3=AJ |title=The prepuce: specialized mucosa of the penis and its loss to circumcision |journal=Br J Urol |date=1996 |volume=77 |issue= |pages=291-295 |url=http://www.cirp.org/library/anatomy/taylor/ |quote= |pubmedID=8800902 |pubmedCID= |DOI=10.1046/j.1464-410x.1996.85023.x |accessdate=2021-07-20}}</ref> The two foreskin layers provide a skin reserve. When the penis becomes erect, the foreskin may wholly or partially unfold to provide the necessary skin to allow for expansion of the penis during erection.