How does the urinary bladder switch from the storage phase to the voiding phase?

Updated: Dec 06, 2018
  • Author: Bradley C Gill, MD, MS; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

Answer

The storage phase of the urinary bladder can be switched to the voiding phase either involuntarily (reflexively) or voluntarily. Involuntary reflex voiding occurs in an infant when the volume of urine exceeds the voiding threshold. When the bladder is filled to capacity, the stretch receptors within the bladder wall signal the sacral cord. The sacral cord, in turn, sends a message back to the bladder to initiate urination.


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