ANATOMY

Detailed explanation-1: -The urethra is the tube that carries urine from the bladder out of the body. The internal urethral sphincter prevents urine from leaving the bladder to enter the urethra. It is controlled by involuntary system. The external urethral sphincter is under voluntary control.

Detailed explanation-2: -Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra.

Detailed explanation-3: -The part of the urethra that is closest to the bladder is called the proximal urethra. The part that is closest to where the urine leaves the body is called the distal urethra. The urethra is about 8 inches long in men and about 1½ inches long in women.

Detailed explanation-4: -The spongy urethra is surrounded by the corpus spongiosum and forms the terminal conduit communicating with the outside of the body.

Detailed explanation-5: -These tubes are called the ureters. The bladder stores urine until it’s time to urinate. Urine leaves the body through another small tube called the urethra. A ureteral obstruction is a blockage in one or both of the tubes (ureters) that carry urine from the kidneys to the bladder.