The foreskin is a retractable double-layered fold of skin and mucous membrane that covers the glans penis and protects the urinary meatus when the penis is not erect. It is also described as the prepuce, a technically broader term that also includes the clitoral hood in women, to which the foreskin is embryonically homologous.
The re-covering of the glans by the foreskin remnant in older men who have had a low and/or loose circumcision, caused by the natural shrinking of the penis. In some cases and in cold conditions, this may lead to the appearance of intactness.
A triangular area of mucosa on the ventral side of the penis with the frenulum at the apex, the ridged band along the sides, and whose base is the junction between the inner and outerforeskin (the transition zone).
The glans penis (or simply glans) is the sensitive bulbous structure at the distal end of the penis. It is also commonly referred to as the "head" of the penis.