The Sternum, shoulder girdle and muscles used to control the head

Question 1

Sternocleidomastoid muscle

Answer 1

Origin - Sternum and clavicle (sternum end)
Insertion - Mastoid Process (skull)
Action - Neck flexion (when both 
contract at once) 
Neck lateral rotation

Question 2

Trapezius

Answer 2

Origin - Occipital bone, Cervical vertebrae,Thoracic vertebrae
Insertion - Clavicle, Acromion, Spine of scapula
Action - Shoulder (scapula): stabilises, elevates, retracts
and rotates