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Background and Objectives: Proper knowledge of muscular variations is essential not only for anatomists but also for surgeons. Forearm flexors are known to exhibit such variations. Such anomalous muscle bellies should be kept in mind while approaching the forearm for FDS tendon transfer and other surgical procedures around it. Materials and Methods: The present study was consisted of 20 upper limbs. The dissections were carried out in all the limbs on the right and left sides. All the muscles were examined for their presence, position, and their attachments, and then the superficial compartment was cut to expose the deep compartment muscles; If any abnormality was found in the muscular pattern, it was recorded in detail and photographed. Result: The incidence of the Gantzer muscle was detected in 9 (45%) of the 20 dissected forearms, three of these cases presented duplicated muscle bellies. It originated from the medial epicondyle in 8(88.9%), and from the coronoid process of ulna in 1(11.1%) of cases. It was inserted in the flexor pollicis lungus in 9(75%) and in the flexor digitorum profundus in 3 (25%). In this study the Gantzer muscle was innervated by the anterior interosseous nerve which crosses posterior to the muscle in all cases. The muscle was 11.022 cm in length and 0.55 cm in width. Conclusion: This study will supplement our knowledge on the possible variations of the muscles in this region, which would be useful for hand surgeons.