NEET PG DENTAL EXAM

Detailed explanation-1: -The internal urethral sphincter regulates involuntary control of urine flow from the bladder to the urethra, and the external urethral sphincter provides voluntary control of urine flow from the bladder to the urethra.

Detailed explanation-2: -The internal urethral sphincter is located at the junction of the urethra and the urinary bladder. It is made of smooth muscle, and is under autonomic or involuntary control. The more inferiorly located external urethral sphincter surrounds the membranous or intermediate part of the urethra.

Detailed explanation-3: -It is a secondary sphincter to control the flow of urine through the urethra. Unlike the internal sphincter muscle, the external sphincter is made of skeletal muscle, therefore it is under voluntary control of the somatic nervous system.