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Anatomy OIA

Muscle Origins, Insertions, and Actions

MuscleOriginInsertionActionRegion
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
Created by: msjessegrrl