To fall first as dead weight cull sternocleidomastoid and allows the head to rotate to the side opposite It also supplies the upper trapeziums muscle and allows the elevation of the shoulders These are movements that are investigated when their performance is studied It asks the patient to turn his head to either side while he resists Then lift your shoulders also against resistance In both cases they are evaluated and compared the forces of either side Twelfth cranial nerve or hypoglossal…