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Testing sternocleidomastoid (SCM) cranial nerve XI-examiner asks patient to actively turn head to one side and then pushes on side of face and tries to push face back to midline, contralateral SCM activates (is seen more prominently)
Medicine and Health Sciences
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Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, "Testing sternocleidomastoid (SCM) cranial nerve XI" (2021). Neurology. 174.