shoulder

Area located at the base of the neck, formed by the scapula and the humerus. The angle of the shoulder usually is the same as that of the foreleg pastern. The more "laid back" the shoulder is, the further out the forelegs can reach, producing an even, rhythmic motion. The heavily muscled shoulder area is one of two regions on the horse's body (the other being the hindquarters) that a jockey is permitted to touch with a whip.