microiontophoresis
nounMedical Definition of microiontophoresis
: a process for observing or recording the effect of an ionized substance on nerve cells that involves inserting a double micropipette into the brain close to a nerve cell, injecting an ionized fluid through one barrel of the pipette, and using a concentrated saline solution in the other tube as an electrical conductor to pick up and transmit back to an oscilloscope any change in neural activity