Intraoperative electrical stimulation of the gyrus angularis

Background: The angular gyrus (AG) is a circumscribed area between the parietal and temporal lobes and its exact function is not clear. The purpose of the present study was to investigate the feasibility of intraoperative electrical stimulation of the AG in humans. Methods: The AG was electrically stimulated in five cases with the assistance of neuronavigation. Two different stimulation techniques were applied: bipolar (BCS) and monopolar (MCS). Results: After MCS, a compound muscle action potential (CMAP) was recorded from the contralateral arm muscles in three patients. In the remaining two patients no CMAP wa…