The Sex Organs - The Male Sex Organs

The External Sex Organs: The Penis

The penis (lat. tail) is a cylindrical organ which contains erectile tissue. To be more precise, there are three elongated spongy bodies inside the penis which extend through its entire length-two running parallel on top (the two corpora cavernosa) and one running along the underside (the corpus spongiosum). This latter body contains the urethra (the duct through which urine and semen are released).

Left: corpora cavernosa
Right: corpus spongiosum