Arm

The arm (Brachium) is much shorter in proportion in domestic Mammals, and especially in great Ungulates, than in the human species; it is strongly flattened against the thoracic wall and not very distinct externally from the neighboring regions. It follows the caudal border of the shoulder and the tip of the shoulder and is followed by the elbow.  The extensors muscles of the forearm, located caudally to the humerus -that forms the axis of the region- are extremely developed, especially in Ungulates, where they attach themselves on all the caudal border of the shoulder. Their mass delimit the tricipital region, whose relief forms a clear overhang (Margo tricipitalis) at the limit of the costal region. The rest of the arm, or the proper brachial region connects craniomedially to the chest.