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Brisk jaw jerk
System: Neurological Signs · All neurological signs
What it is — and how it is elicited
Tapping down on the chin with the mouth slightly open produces an exaggerated snapping closure of the jaw.
What a positive finding suggests
Associated with bilateral upper motor neuron lesions above the level of the pons, as in pseudobulbar palsy.
Related signs — Neurological Signs
Browse the B section of the A–Z list or return to the Clinical Signs hub.
Please note: This page is an educational reference about clinical examination signs. A clinical sign supports — and never replaces — a full clinical evaluation, examination and appropriate testing. A sign being present does not by itself prove a diagnosis, and an absent sign does not rule one out. If you have symptoms that worry you, see a health professional.