jerk reflex

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• Jaw jerk reflex — The jaw jerk reflex or the masseter reflex is a stretch reflex used to test the status of a patient s trigeminal nerve (CN V).[1] The mandible or lower jaw is tapped at a downward angle just below the lips at the chin while the mouth is held… …   Wikipedia

• Ankle jerk reflex — The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsi flexed. A positive result would be the jerking of the foot towards its plantar surface. The Achilles reflex checks if the… …   Wikipedia

• Achilles bursa jerk (reflex) tendon — Achil·les bur·sa, jerk (reflex), tendon (ə kilґēz) [Gr. Achilleus Greek hero, whose mother held him by the heel to dip him in the Styx] see bursa tendinis calcanei, triceps surae jerk, under jerk, and tendo calcaneus …   Medical dictionary

• knee-jerk reflex — noun a reflex extension of the leg resulting from a sharp tap on the patellar tendon • Syn: ↑knee jerk, ↑patellar reflex • Hypernyms: ↑reflex, ↑reflex response, ↑reflex action, ↑instinctive reflex, ↑ …   Useful english dictionary

• knee-jerk reflex — ▪ medical test also called  patellar reflex        sudden kicking movement of the lower leg in response to a sharp tap on the patellar tendon, which lies just below the kneecap. One of the several positions that a subject may take for the test is …   Universalium

• jaw-jerk reflex — an abnormal reflex elicited by lightly placing the index finger across the chin of the patient and tapping it with a tendon hammer while the jaw hangs loosely open. A brisk upward movement of the jaw indicates an upper motor neurone disorder… …   The new mediacal dictionary

• Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

• Reflex — For other uses, see Reflex (disambiguation). A reflex action, also known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus.[1] A true reflex is a behavior which is mediated via the reflex arc; this does… …   Wikipedia

• reflex action — noun an automatic instinctive unlearned reaction to a stimulus • Syn: ↑reflex, ↑reflex response, ↑instinctive reflex, ↑innate reflex, ↑inborn reflex, ↑unconditioned reflex, ↑physiological reaction …   Useful english dictionary

• reflex response — noun an automatic instinctive unlearned reaction to a stimulus • Syn: ↑reflex, ↑reflex action, ↑instinctive reflex, ↑innate reflex, ↑inborn reflex, ↑unconditioned reflex, ↑physiological reaction …   Useful english dictionary

• jerk — jerk1 [jʉrk] vt. [var. of archaic yerk < ?] 1. to pull, twist, push, thrust, or throw with a sudden, sharp movement ☆ 2. [Old Informal] to make and serve (ice cream sodas) vi. 1. to move with a jerk or in jerks 2. to twitch n …   English World dictionary