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Electromyographic evaluation of an accessory hand muscle
Author(s) -
McManis Philip G.,
Daube Jasper R.
Publication year - 1989
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880120604
Subject(s) - anatomy , electromyography , denervation , extensor digitorum muscle , medicine , motor unit , extensor muscle , radial nerve , extensor digitorum communis , physical medicine and rehabilitation , skeletal muscle , soleus muscle
Accessory hand muscles consistent with extensor digitorum brevis manus muscles were noted in a young women. Well‐defined compound muscle action potentials were elicited in these muscles with stimulation of the radial nerve. Needle electromyography showed poor recruitment and large motor unit potentials with frequent cramp discharges only in the anomalous muscles. Therefore, the extensor digitorum brevis manus is innervated by the posterior interosseous nerve, and symptoms may be due to chronic denervation and cramping.