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Muscle: Sternocleidomastoideus
Origin: Sternum, clavicular
Insertion: Mastoid process
Action: Rotates head
Muscle: Splenius Capitis
Origin: Seventh cervical, thoracic vertebrae
Actions: Extends, laterally flexes the head
Muscle: Platysma
Origin: Pectoralis major, deltoideus
Insertion: Mandible
Action: Draws down the lower lip
Muscle: Deltoideus
Origin: Clavicle, scapula
Insertion: Humerus
Action: Flexion, abducts, extends the arm
Muscle: Pectoralis Major
Origin: Sternum, clavicle and external oblique muscle
Actions: Adducts, medially rotates arm
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