What is provided is a method and apparatus for modifying bladder function comprising: applying a dermal patch having an integral electrode in proximity to a sacral or pudendal nerve； selecting the sacral or pudendal nerve by a sensor integral on the dermal patch； determining a stimulation corresponding to the sacral or pudendal nerve, by logic of the dermal patch； applying the stimulation by the electrodes and a stimulator integral to the dermal patch to produce an electric field； and selectively activating the sacral or pudendal nerve by the electric field.
