jaw jerk (redirected from Jaw jerk reflex)

jerk (jurk) a sudden reflex or involuntary movement.jer´ky

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Achilles jerk , ankle jerk triceps surae reflex.

biceps jerk  see under reflex.

elbow jerk  triceps reflex.

jaw jerk  see under reflex.

knee jerk , quadriceps jerk patellar reflex.

tendon jerk  see under reflex.

triceps surae jerk  see under reflex.

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jaw jerk,

an abnormal reflex elicited by tapping the chin with a rubber hammer while the mouth is half open and the jaw muscles are relaxed. A quick snapping shut of the jaw implies damage to the area of cerebral cortex governing motor activity of the fifth cranial nerve. Also called chin reflex, chin-jerk reflex, mandibular reflex.

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jerk [jerk]

a sudden reflex or involuntary movement.

Achilles jerk (ankle jerk) plantar extension of the foot elicited by a tap on the achilles tendon, while the patient is seated on a bed or chair, with feet hanging freely; called also Achilles reflex and triceps surae jerk or reflex.

biceps jerk biceps reflex.

elbow jerk involuntary flexion of the elbow on striking the tendon of the biceps or triceps muscle.

jaw jerk jaw-jerk reflex.

knee jerk see knee jerk.

tendon jerk tendon reflex.

triceps surae jerk ankle jerk.