Muscle Anatomy

serratus anterior

The serratus anterior muscle is located on the lateral aspect of the chest wall, covering the upper and middle ribs. It is a fan-shaped muscle that spans from the upper eight or nine ribs to the scapula.

Originating from the outer surfaces of the upper eight or nine ribs, the serratus anterior takes its starting point from the bony structures of the ribcage.

The muscle inserts into the anterior surface of the medial border of the scapula, extending from the superior angle to the inferior angle. This insertion site establishes a connection with the shoulder blade.

Functionally, the serratus anterior is crucial for the stability and movement of the scapula. It plays a key role in protracting and rotating the scapula, allowing the arm to be lifted overhead. Additionally, the muscle contributes to the control and positioning of the scapula during activities like pushing, punching, or lifting. The serratus anterior is instrumental in maintaining proper scapular mechanics and shoulder function, playing a role in overall upper limb movement and stability.