Penis
The penis is made up of:Two chambers called the corpora cavernosa, which run the length of the organ and contain a maze of blood vessels shaped like cavernous spaces (like a sponge).
The urethra, or channel for urine and sperm, which runs along the underside of the corpora cavernosa.
Erectile tissue, which surrounds the urethra, two main arteries and several veins and nerves.
- The shaft, the longest part of the penis.
- The head (glans), which is at the end of the shaft.
- The meatus, or opening at the tip of the head where urine and semen are discharged.