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Medical Definition of Erb paralysis
1. A type of brachial birth palsy in which there is paralysis of the muscles of the upper arm and shoulder girdle (deltoid, biceps, brachialis, and brachioradialis muscles) due to a lesion of the upper trunk of the brachial plexus or of the roots of the fifth and sixth cervical roots. Synonym: Duchenne-Erb paralysis, Erb paralysis. (05 Mar 2000)