The Neurosign® range of multi-channel electromyogram (EMG) nerve monitors help prevent nerve damage during complex surgical procedures by providing surgeons with audible feedback on the location and integrity of nerves. Reduced risk of nerve injury during surgery is an important contribution to improved patient care. Ideal for ENT, spinal and neurosurgery, Neurosign detects very small voltages created in muscles when they contract (Compound Muscle Action Potentials - CMAP) through the positioning of un-insulated needle electrodes. When the nerve at risk is disturbed by the surgeon, the muscle it controls contracts and the nerve monitor amplifies the EMG signal and audibly alerts the surgeon. Now coupled with the Digitimer D185 cortical stimulator, the Neurosign 800 model provides the additional functionality of being able to stimulate the motor cortex and evoke a motor volley down the spinal cord. In this way, the Neurosign 800 provides a simple and effective means of monitoring the spinal cord during selective spinal procedures.