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The well‐developed m. epitrochleoanconeus (ETA) of macaques. It originates from the medial epicondyle of the humerus and inserts onto the medial border of the olecranon. As it crosses the cubital tunnel, the ETA protects the ulnar nerve. Activation of the ETA potentially facilitates forearm extension and/or stabilization of the elbow joint during quadrupedal walking [Colour figure can be viewed at wileyonlinelibrary.com]
