An Anatomical Variation Of Extensor Indices Muscle: A Case Report

Extensor indices are a narrow muscle, which lies medial and parallel to extensor pollicis longus muscle. It arises from the posterior surface of the ulna, distal to extensor pollicis longus and also the adjoining interosseous membrane. The tendon is formed just proximal to the wrist and passes under the extensor retinaculum in the fourth compartment with the tendon of extensor digitiorum.