Cavernous bodies : the dorsal face of the penis is made up of two cylinders of erectile tissue, the cavernous bodies. During sexual stimulation, they fill with blood, which causes the erection. Spongy body : the spongy body is a cylinder of erectile tissue that surrounds the urethra. It begins near the perineum and turns into the glans penis.
Cavernous bodies : the dorsal face of the penis is made up of two cylinders of erectile tissue, the cavernous bodies. During sexual stimulation, they fill with blood, which causes the erection. Spongy body : the spongy body is a cylinder of erectile tissue that surrounds the urethra. It begins near the perineum and turns into the glans penis.