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Arm phenomenon --> pools phenomenon

in tetany, spasm both of the extensor muscles of the knee and of the calf muscles when the extended leg is flexed at the hip.

Synonym: leg phenomenon, pool-schlesinger sign, schlesingers sign.

in tetany, contraction of the arm muscles following the stretching of the brachial plexus by elevation of the arm above the head with the forearm extended, resembles the contraction resulting from stimulation of the ulnar nerve.

Synonym: arm phenomenon.