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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Are Cranial Nerves VIII And VII Mapped Or Identified?

Hello. I am a pharmacist, not a physician. Can you explain to me how cranial nerves VIII and VII are mapped or identified, to prevent damage when using cyber knife to remove a vestibular schwannoma in a 70 year old male? Thank you for your response.
Mon, 13 Jul 2015
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Neurologist, Surgical 's  Response
Cranial nerve VII - Electrodes are connected to your facial muscles and the area near the nerve is simulated intraoperatively, so that the muscle twitching can be appreciated and thus avoid injury to the nerve.
Cranial nerve VIII - Electrodes are placed in the scalp and the waves in the hearing pathway from cochlea till brain are recorded and any variation in the wave suggests a new lesion.
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How Are Cranial Nerves VIII And VII Mapped Or Identified?

Cranial nerve VII - Electrodes are connected to your facial muscles and the area near the nerve is simulated intraoperatively, so that the muscle twitching can be appreciated and thus avoid injury to the nerve. Cranial nerve VIII - Electrodes are placed in the scalp and the waves in the hearing pathway from cochlea till brain are recorded and any variation in the wave suggests a new lesion.