| triceps surae reflex |
plantar flexion of the foot caused by a twitchlike contraction of the triceps surae muscle, elicited by a tap on the Achilles tendon preferably while the patient kneels on a bed or chair, the feet hanging free over the edge; called also Achilles jerk, ankle jerk, triceps surae jerk, Achilles tendon r., and ankle r.
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