Answer: A - N9 potential arises from brachial plexus. In radiculopathy and avulsion of posterior and anterior roots of brachial plexus, the N9 potential is not affected, whereas after one week the N9 becomes unrecordable due to the retrograde Wallerian degeneration. Dorsal cervical roots produce N11 waveform.Rostral cervical cord produces N13 wave form.Primary sensory cortex produces N20 wave form.

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PTA Physical Therapy Assistant

Category - Diseases and Conditions

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In a median somatosensory evoked potential, what generates an N₉ wave form?

Brachial plexus
Dorsal cervical roots
Rostral cervical cord
Primary sensory cortex

Explanation

Answer: A - N₉ potential arises from brachial plexus.

In radiculopathy and avulsion of posterior and anterior roots of brachial plexus, the N₉ potential is not affected, whereas after one week the N₉ becomes unrecordable due to the retrograde Wallerian degeneration.

Dorsal cervical roots produce N₁₁ waveform.

Rostral cervical cord produces N₁₃wave form.

Primary sensory cortex produces N₂₀ wave form.

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