What is the role of the parasympathetic nervous system in the neuroanatomy of neurogenic bladder?

Updated: Dec 24, 2020
  • Author: Bradley C Gill, MD, MS; Chief Editor: Edward David Kim, MD, FACS  more...
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The parasympathetic nervous system functions in a manner opposite to that of the sympathetic nervous system. In terms of urinary function, the parasympathetic nerves stimulate the detrusor to contract. Immediately preceding parasympathetic stimulation, the sympathetic influence on the internal urethral sphincter becomes suppressed so that the internal sphincter relaxes and opens. In addition, the activity of the pudendal nerve, a somatic nerve, is inhibited to cause the external sphincter to open. The result is facilitation of voluntary urination.

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