The urethra is a tube that directs urine from the the urinary bladder
to outside of the body.
The urethra's wall is lined with a mucous membrane, it also has a
relatively thick layer of smooth muscle tissue. The smooth muscle fibers
within the urethra run longitudinally. Dispersed throughout the urethra
are mucous glands, called urethral glands, that secrete mucous into the