The serratus anterior, also known as serratus magnus, is a muscle of the chest. It originates at the side of the chest from the upper 9 ribs; it inserts along the entire length of the anterior aspect of the medial border of the scapula.
The serratus anterior, also known as serratus magnus, is a muscle of the chest. It originates at the side of the chest from the upper 9 ribs; it inserts along the entire length of the anterior aspect of the medial border of the scapula.
Source: Wikipedia "Serratus anterior muscle" · CC BY-SA 4.0
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