#urinary_bladder__urinarybladder  a membranous sac for temporary retention of urine
  supertype:  vesica__bladder  a distensible membranous sac (usually containing liquid or gas)
  part of:  urogenital_system  urinary_tract
  part:  bladder_sphincter__bladdersphincter__musculus_sphincter_vesicae  the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening

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