These bands and cords are called the trabeculae of corpora cavernosa of penis, and consist of white fibrous tissue, elastic fibers, and plain muscular fibers. In them are contained numerous arteries and nerves.
The component fibers which form the trabeculæ are larger and stronger around the circumference than at the centers of the corpora cavernosa; they are also thicker behind than in front.
The interspaces (cavernous spaces), on the contrary, are larger at the center than at the circumference, their long diameters being directed transversely.
They are filled with blood, and are lined by a layer of flattened cells similar to the endothelial lining of veins.