GENERAL HISTOLOGY

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: -control by autonomic nervous system The external urinary sphincter, which works in concert with the internal sphincter, is made up of skeletal muscle controlled by motor fibres of the pudendal nerve.

Detailed explanation-3: -The innervation of the urethral sphincter is from both the somatic and the autonomic nervous systems. Urination is prevented by the voluntary motor innervation of the EUS muscle. The striated sphincter is innervated by the pudendal nerve from the S2 to S4 nerve roots [28, 29].