What must be inhibited for micturition to occur?

For micturition to occur, the sympathetic nervous system's influence on the bladder must be inhibited, allowing the detrusor muscle to contract and the internal urethral sphincter to relax. Additionally, the external urethral sphincter, which is under voluntary control, must also be inhibited to permit the flow of urine. This coordinated action ensures that urine is expelled from the bladder effectively.