gastrocnemius reflex

ankle reflex

An abrupt plantar jerk of the ankle, evoked by tapping the Achilles tendon with an unrestricted forefoot.

Slightly externally rotate at the hip and gently dorsiflex the foot, tapping the Achilles tendon with a reflex hammer; there should be a reflex contraction of the gastrocnemius muscle (plantar flexion).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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Gastrocnemius reflex was absent in 8.3% of cases, depressed in 5.5% of cases and normal in 86.1% of cases for left rear limb.