Anatomy Muscle Actions (Superficial neck/ superficial muscles of thorax and shoulder)
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Depresses mandible; pulls lower lip back and down
Flexion of neck; rotate head toward shoulder on opposite side
Flex and slightly rotate neck
Scalenes- anterior, middle, and posterior
Prime mover of arm flexion; adducts, medially rotates arm
Moves scapula forward toward chest wall
Prime mover of arm abduction
Draws scapula forward and inferiorly; draws rib cage superiorly
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