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Accessory nerve palsy

Authoring team

Accessory nerve palsy is paralysis of the muscles supplied by the accessory nerve, cranial nerve XI.

Clinical features include:

  • possible loss in function and muscle mass in the trapezius and the sternomastoids

During the neurological examination the function of the accessory nerve is assessed as follows:

  • sternocleidomastoid - turning of the head against a force applied by the examiner
  • trapezius - the ability to shrug against a downward force applied the examiner

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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