Everything about The Jaw Jerk Reflex totally explained
The
jaw jerk reflex is a motor
reflex used to test the status of a patient's
trigeminal nerve (CN V). The
mandible—-or lower jaw—-is tapped at a downward angle just below the lips at the chin while the mouth is held slightly open. Normally this reflex is absent or very slight. However in individuals with
upper motor neuron lesions the jaw jerk reflex can be quite pronounced.
As with most other reflexes, the response to the stimulus is
monosynaptic, with sensory
neurons of the trigeminal mesencephalic nucleus sending
axons to the trigeminal motor nucleus, which in turn innervates the
masseter. This reflex is used to judge the integrity of the upper motor neurons projecting to the trigeminal motor nucleus. Both the sensory and motor aspects of this reflex are subserved by CN V.
It isn't part of a standard
neurological examination, being used rather if there are other signs of damage to the trigeminal nerve.
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