Ridged Band
Fig. 2
Figure 2. Erect adult penis. The foreskin adheres to the glans by friction and surface tension. As a result, the foreskin peels (rather than slides) back when it is retracted. Until the foreskin is retracted, the erect penile shaft is covered mainly by shaft skin. However, the scrotum makes an important contribution to the skin covering the base of the penile shaft. The scrotum contracts strongly during erection, thanks to its Dartos muscle. Although it is less obvious in a photograph, Dartos muscle also causes shaft skin and foreskin to contract during erection. This process takes up much of the slack in penile skin resulting from retraction of the foreskin onto the shaft of the penis.
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