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Question Date: 14/02/2024

Question: In median nerve somatosensory evoked potentials, theN13 peak corresponds with which anatomicallocation?

Options:

Medial meniscus
Cerebral cortex
Thalamus
Cervical spinal cord

Correct Answer: Cervical spinal cord

Explaination: Somatosensory evoked potentials are used to evaluate the sensory system from the lumbar roots to the somatosensory cortex. Peripheral nerves are stimulated with repeated electric shocks, which move up the dorsal columns of the spinal cord to the somatosensory cortex. Along the path various waveforms can be recorded, which are either positive (P) or negative (N), and a number that corresponds to the typical latency expected. The N13 peak represents a near-field potential recorded over the cervical spine. Erbs point is represented by the N9 peak. The brainstem and medial meniscus are involved in the P14, which is a far-field potential. The N20 is the cortical response and is usually best recorded over the contralateral hemisphere