Fig. 1
From: An ontology-based tool for modeling and documenting events in neurosurgery

Schematic visualization of the pathway with MEPs. Transcranial electrical stimulation (yellow flash) of the motor cortex results in a response that is transmitted through the brain and spinal cord to cause muscle contraction. Here a brain tumor (brown) infiltrates the motor pathways. By using IOM techniques, as much tumor as possible can be removed with the goal of preserving motor function at the same time