Serratus Anterior

Serratus anterior is context-dependent rather than inherently good or bad. At the scapula, the serratus anterior contributes to protraction, abduction, internal rotation, and upward rotation. When the serratus anterior contracts, it can relatively straighten or externally rotate the ribs. The rib cage side of the serratus anterior is important because the muscle wraps along the curved rib cage. More serratus activity is not automatically desirable even if it helps hold the scapula against the thorax. The serratus anterior attaches to the upper eight or nine ribs and the medial border of the scapula.