Jaw-jerk reflex

Definition

The jaw-jerk reflex is a stretch reflex of the muscles involved in jaw closure, triggered by tapping the jaw lightly. It tests the integrity of the trigeminal nerve (cranial nerve V) and is part of the neurological examination focusing on cranial nerves.

Related terms

Trigeminal Nerve:

The fifth cranial nerve responsible for facial sensation and motor functions such as biting and chewing.

Stretch Reflex: A muscle contraction in response to stretching within the muscle, helping maintain posture and protect muscles from damage.

Cranial Nerve Exam:

Part of a neurological examination that assesses the function of cranial nerves, including sensory and motor responses