👉 The term "urosteon" refers to a group of organs that are located at the base of the penis. These include the urethra, which is the tube that carries urine from the bladder into the body, and the ureter, which is the tube that carries urine from the kidney into the bladder. The urethra also contains the urethral sphincter, a muscle that helps to keep urine in the bladder or urethra when urination occurs.