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Anatomy OIA
Muscle Origins, Insertions, and Actions
Muscle | Origin | Insertion | Action | Region |
---|---|---|---|---|
Scalenus Anterior | Transverse processes of 3rd through 6th cervical vertebrae | Inner border of first rib | Raises 1st rib; acting bilaterally they flex neck, acting unilaterally they laterally flex and rotate the neck. | Neck |
Scalenus Medius | Transverse processes of C2-C7 | Upper surface of first rib | Raises first rib; bilaterally flex the neck, unilaterally they laterally flex or rotate the neck | Neck |
Scalenus Posterior | Transerse processes of C5-C7 | Outer surface of 2nd rib | Raises 2nd rib; Acting together the flex the neck; acting on one side the laterally flex, rotate neck | Neck |
Rectus Capitis Posterior Major | Spinous process of axis | Lateral portion of inferior nuchal line | Extends head, rotates head | Neck |