Definition of "Jaw jerk reflex"

Last modified: 2 days



Stretch reflex which tests the trigeminal nerve CN5. The mandible (lower jaw) is tapped just below the lip, while the mouth is held slightly open. This should cause the mandible to jerk upwards slightly or not at all.

In Pt's with UMN lesion, the jaw jerk can be quite pronounced.    


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Definition of Jaw jerk reflex | Autoprac


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