The tunica albuginea is a sheath of dense irregular connective tissue that surrounds the erectile bodies.

The corpora vavernosum is a pair of vascular channels located dorsally within the penis. The walls and trabeculae consist of connective tissue and smooth muscle. Specifically, the smooth muscle is abundant in trabeculae and relaxes during erection. The helicine arteries are normally coiled, but straighten and dilate on erection. Blood Sinuses are also found in this channel which is a labyrinth lined with endothelial cells and become filled with blood during erection. There is also the central artery or the deep artery of the penis, each corpus contains a single, central artery.

The corpus spongiosum is located ventrally within the penis. It has erectile tissue similar in structure to the corpora cavernosum but does not become as turgid on erection. The urethra is lined with a pseudostratified columnar epithelium and the mucous glands of littre and ducts secrete a clear mucus on erection.

The superficial fascia is also observed, it is a connective tissue that surrounds the penis with many blood vessels and nerves.