Evoked potentials from the motor tracts in humans

Area of Science:

• Neurosurgery
• Spinal Cord Monitoring
• Neurophysiology

Background:

• Spinal cord injury prevention during surgery necessitates reliable monitoring of motor pathways.
• Current methods lack direct assessment of the spinal cord motor tracts.

Observation:

• A technique stimulating the area overlying the motor tract (between intermediolateral sulcus and dentate ligament) was tested in cats.
• This stimulation produced a distinct 100-m/s signal, abolished by motor area section, confirming its specificity.

Findings:

• The technique was successfully applied in humans, replicating the 100-m/s signal and identifying slower components.
• Direct stimulation of the motor tract area elicited distal limb movement, unlike dorsal column stimulation.

Implications:

• This method provides a direct, real-time assessment of spinal cord motor tract integrity during surgery.
• Applicable in open and percutaneous procedures, it enhances surgical safety and spinal cord function evaluation.