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Jaw Jerk

Overview

  • The jaw jerk is also known as the masseter inhibitory reflex; it involves the mandibular branch of the trigeminal nerve as both its afferent and efferent arms.
    • How to Elicit

    • Place a finger horizontally over the chin with the mouth open. Strike this finger with a tendon hammer. Warn the patient beforehand.
    • Interpretation

    • Slight / absent jerkNormal, mandibular nerve (V3) lesion
    • Exaggerated jerk (± clonus)Upper motor neuron lesion
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