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Neurological control

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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  • parasympathetic nerves (S2,3,4) initiate contraction of the bladder
  • there is some sympathetic innervation of the trigone and the urethra (both alpha-contraction, and beta-relaxation)
  • higher motor centres facilitate voluntary control of bladder emptying (centres in the pons, midbrain, posterior hypothalamus and ultimately in the frontal lobe of the cerebral cortex)
  • cholinergic stimulation results in contraction of the detrusor muscle and trigone - this leads to an increased intravesical pressure and funnelling/shortening of the upper part of the urethra

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