The Anatomy of the Penis:

This consists of two parallel corpora cavernosa (cavernous bodies) in line with the corpius spongiosum (spongy body), which encircles the urethra on the underside of the penis and expands as its tip to form the glands. Proximally, the corpora cavernosa are attached to the pelvis just anteriorto the ischial tuberosities, and binding the three together is a thick fascia, Buck’s fascia. Covered in turn by the superficial or Colles fascia. The trabecular structure of the corpora consists of smooth muscle and firbroelastic tissue; the muscle relaxes on sexual arousal, causing the penis to become erect with incoming blood. Over all this is the very loose and mobile penile skin, which allows the penis to expand during erection.

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