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Dermatomal Somatosensory Evoked Potentials

In this modality, stimulating electrodes are placed over a dermatome rather than a specific nerve. A dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root. Dermatomes are clinically important and necessary for assessing and diagnosing the level of spinal cord injury.

Dermatomal Somatosensory Evoked Potentials

DSEP stimulates root specific dermatomes (skin areas) via patch electrodes and recordings are made from scalp electrodes.


Dermatomal responses provide sensory nerve root information through amplitude and latency measurements. This allows specific dermatomes to be compared at baseline and at other times during the procedure to detect any improvements. Dermatomes can be useful during posterior cervical and posterior lumbar procedures. Dermatomal responses can be run continuously throughout the surgery.