The two corpora cavernosa and<unk>  spongiosum (also known as the<unk><unk>  urethrae in older texts and in the adjacent diagram) are three expandable erectile tissues along the length of the penis, which fill with blood during penile erection. The two corpora cavernosa lie along the penis shaft, from the pubic bones to the head of the penis, where they join. These formations are made of a sponge-like tissue containing trabeculae, irregular blood-filled spaces lined by endothelium and separated by septum of the penis. The male anatomy has no vestibular bulbs, but instead a<unk>  spongiosum, a smaller region along the bottom of the penis, which contains the urethra and forms the glans penis.
Corpus cavernosum penis
Vas deferens
Iris sphincter muscle
Penis captivus
Meibomian gland
Penis
Subfornical organ
Palatal obturator