The penis is composed of 3 cylindrical bodies: 2 corpora cavernosa and 1 corpus spongiosum. (See Figure 1. ) The 2 corpora cavernosa on the dorsal aspect fill with blood to create and maintain erection. (See Figure 2. ) The corpora cavernosa are surrounded by a connective tissue fascia, called the tunica albuginea. The corpus spongiosum lies beneath the corpora cavernosa and surrounds the urethra. It does not contain erectile tissue. All 3 of these cylindrical bodies are covered by Buck’s fascia. The blood supply to the penis is from the internal pudendal artery. Dorsal penile sensation is provided by the dorsal nerve of the penis, a branch of the internal pudendal nerve. Ventral sensory innervation is supplied by the ilioinguinal nerve and branches of the perineal nerve and cutaneous nerve of the thigh.15,16 Lymphatics of the penis drain into deep and superficial inguinal nodes.
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