Introduction: The palm branch of the median nerve has a lateral and a medial division. From the lateral division descend from the motor branch of the medial nerve. This branch can emerge in a extraligamentous, subligamentous and transligamentous forms. Being the medial nerve the biggest variation. To intend to observe the variation of the branch medial motor nerve classify it as extraligamentous, subligamentous or tranligamentous and if there are duplications of the branch with the objective of minimizing possible iatrogenesis during the surgical act. Materials and Methods: This study it’s a kind of descriptive one with analysis of the variations of the branch medial motor of 20 hands, 10 right and ten left ones, that was earlier prepared by formaldehyde injection a 10%. It was realized a longitudinal cut in anterior part of the hand face, extending from the metacarpophalangeal articulation pleat until the main wrist pleat flexion. Then it was made a transverse incision covering the entire articulation pleat. Snapped up all the skin subcutaneous tissue and muscular fascia. It was done a longitudinal incision in the carpal ligament in order to show the path of the motor branch. All pieces were numbered and photographed. Results and Conclusion: From the left hands were found 9 extraligamentous, where one of them was duplicated, and 1 subligamentous. From the rights, 9 extraligamentous and 1 subligamentous. There was no tranligamentous situation. In 90% of the cases it was observed the extraligamentous situation and in 10% subligamentous which are compatible with the literature data that revolve around these values.