Erection of the penis involves the filling of the vascular spaces of the corpora cavernosa and corpus spongiosum

The penis consists principally of two dorsal masses of erectile tissue, the corpora cavernosa, and a ventral mass of erectile tissue, the corpus spongiosum, in which the spongy part of the urethra is embedded. A dense, fibro-elastic layer, the tunica albuginea, binds the three together and forms a capsule around each (Fig. 21.30). The corpora cavernosa contain numerous wide, irregularly shaped vascular spaces lined with vascular endothelium. These spaces are surrounded by a thin layer of smooth muscle that forms trabeculae within the tunica albuginea interconnect-

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