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Normal micturition; certain details as shown by serial cystograms.

Serial cystograms were made during micturition, using a roll film cassette. It was observed that detrusor contraction can be the first activity in normal urination, immediately followed by relaxation of the perineum. The "external sphincter" can shut off the urinary stream as an isolated movement preceding elevation of the bladder base.

Muscle, Smooth↗