- A dictionary of medical eponyms

Achilles' tendon reflex

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Plantar flexion extension of foot resulting from contraction of calf muscles following a sharp blow to the Achilles tendon. The variations and their significance correspond closely to those of the knee jerk. It is exaggerated in upper motor neuron disease and diminished or absent in lower motor neuron disease. The character of the response is influenced by the metabolic rate.

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