Hoffmann's sign

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(finger-flexion reflex) an abnormal reflex elicited by flicking the distal phalanx of the patient’s middle finger sharply downwards. Hoffmann’s sign is positive when there is a brisk flexion response in the index finger and thumb. It indicates an upper motor neuron response due to a disorder at or above the cervical (neck) level of the spinal cord. J. Hoffmann (1857–1919), German neurologist

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