The serratus anterior is a fan-shaped muscle that originates on the superolateral surfaces of the first to eighth ribs or the first to ninth ribs at the lateral wall of the thorax and inserts along the superior angle, medial border, and inferior angle of the scapula.
The serratus anterior muscle is a key stabilizer of the scapula and that is how it should be used in many yoga postures. The serratus anterior muscle upwardly rotates the scapula to get the arms over the head.
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