This multi-headed muscle forms the lateral part of the chest wall, giving it a "serrated" appearance. It originates from the superior borders of the upper nine ribs, inserting on the medial border of the scapula from the inside. Contracting this muscle draws the scapula forward and away from the midline and relaxing it allows the scapula to be drawn toward the midline opening the chest.
Serratus Anterior (ser-RA-tus an-TEER-I-or)
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