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In girls, the genital fold remains open, in boys it grows together. It transforms into the inner labia and the clitoral hood in girls, and into the [[foreskin]] in boys. The labioscrotal swelling becomes the outer labia and scrotum respectively.
The growing together of the folds results in the seam that runs from the underside of the scrotum and the penile shaft up to the tip of the foreskin. The penis now consists of the shaft containing the erectile tissue, with the glans at the top. The shaft is surrounded by the [[shaft skin]] which, however, is not knitted to it. This mobility, combined with the [[stretching ]] capabilities of the [[skin]], allows for the growth in dimension of the penis during an [[erection]]. During an [[erection]] the erectile tissue fills with blood, giving the penis its stiffness and enlarged size.
In the area of the [[glans]] the [[shaft skin]] transitions into the outer layer of the foreskin, which extends past the tip of the glans. Parallel to that runs the inner layer of the foreskin. It is attached behind the rim of the glans, and runs between the glans and the outer foreskin layer, also past the tip of the glans. At the tip, the inner and outer foreskin layers are joined together.