Which muscle helps you turn your face from side to side?

• A. Sternocleidomastoid
• B. Levator Scapula
• C. Serratus
• D. Temporalis

Answer: (A)

Turning your head from side to side is mainly controlled by the sternocleidomastoid. When one side tightens, it rotates the head toward the opposite shoulder, so using this muscle on one side lets you look to the other direction. It also flexes the neck when both sides work together. The sternocleidomastoid runs from the sternum and clavicle to the mastoid process behind the ear, which gives it the leverage to move the head effectively. The other muscles listed don’t primarily cause head rotation: levator scapula moves the shoulder blade, serratus anterior helps with scapular and rib movement, and the temporalis is a jaw muscle involved in chewing.