Definitions for "Urethral sphincter"
muscle that holds the bladder closed
A ring-like muscle that surrounds the urethra and helps hold it closed, preventing unintentional leakage. When relaxed, a sphincter allows materials such as urine to pass through the opening.21
the muscular structure responsible for opening and closing of the urethra; there are two urethral sphincters - the internal urethral sphincter and the external urethral sphincter.