The foreskin is a sleeve of tissue which covers the penis. At birth the foreskin is tightly attached. By mid-childhood it can be pulled over the penis when the penis is flaccid, or retracted back over the shaft of the penis during urination or erection.
Update Date 11/7/2011
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.