The penis is composed of three cylindrical bodies: the two corpora cavernosa, which form the main bulk of the penis, and the corpus spongiosum, which surrounds the urethra (Fig 91-1). The corpora cavernosa are the major erectile bodies, extending distally from the pubic rami and capped by the glans penis. These two cylindrical structures are encased in a thick tunic of dense connective tissue, the tunica albuginea. All three cylinders are collectively covered by a thinner Buck's fascia, which fuses with Colles's fascia at the level of the urogenital diaphragm.

FIG. 91-1. Cross section of the penis.

Ihe blood supply is primarily from the internal pudendal artery, which branches to form the deep and superficial penile arteries. Lymphatic drainage is into the deep and superficial inguinal nodes.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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