The authors dissected 72 paired arm to study the anatomy of Gantzer's muscle. The dissection explored course of the median nerve from the elbow to the distal end of the forearm. The following anatomical structures and variations were noted;
(1) The presence of a Gantzer's muscle, as well as its relationship to the median and anteriorinterosseous nerves.
(2) The origin and insertion of Gantzer's muscle.
Results: Gantzer's muscle arose from the medial epicondyle of the humerus in 45 arms (90%), from the coronoid process of the ulna in 3 arms (6%), from the intermuscular fascia in 1 arm (2%), and from a double origin- the medial epicondyle and the coronoid presess-in 1 arm (2%). Insertion was to the proximal part of the tendon of the flexor pollicis longus muscle in all arms.
Gantzer's muscle always lies posterior to the median nerve. In 12 out of 50 arms, the muscle passed posterior to the anterior interosseous nerve, and in the remaining 38 arms, the anterior interosseous nerve ran proximal to the muscle along its proximal border and never cross Gantzer's muscle and its tendon.
Based on these findings, the authors concluded that Gentzer's muscle rarely contributes to anterior interosseous nerve compression in the proximal forearm.
