Origin Junction of the first rib with its costal Action cartilage
Insertion Groove on the inferior (lower) surface of the clavicle
Depresses clavicle, draws shoulder forward and downward, steadies clavicle during movements of shoulder girdle C5, C6
Origin Tip (apex) of the coracoid process Nerve Musculocutaneous nerve (C6, C7)
of scapula Relationships Deep to short head of biceps
Insertion Middle third of the medial surface and border of the humerus Action Weakly adducts arm (flexion unsubstantiated), aids in stabilizing humerus
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