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Head and Neck Skull superior Skull lateral F S P T Skull posterior THE SKULL AT BIRTH مفصل فک تحتانی 10 Elevation 11 Head movements Head movements Atlanto – axial joint (rotation) Atlanto - occipital joint (flextion/xtension) Extension Flexion Sternocleidomastoid ORIGIN Sternum and clavicle INSERTION Mastoid ACTION Flexes and rotates the head Trapezius ORIGIN Spinous processes of cervical and thoracic vertebra INSERTION posterior of clavicle and spine of scapula ACTION If scapula is fixed, extends neck Rotation Facial expression 20 21 22 Facial expression SCALP