When removing brain tumours pushing away or deforming nearby cranial nerves, it is of vital importance to know where exactly these brain nerves are situated and which consequences any manipulation may have.
To obtain this information, electrodes are inserted into the muscles controlling these nerves. These are very fine needles that are connected to a monitoring device.
During surgery, the surgeon can observe exactly – using direct stimulation – where the brain nerve is situated and thus avoid damaging it.
This technique is particularly crucial for removing acoustic neuromas.