The Serratus Anterior muscle is used in activities which draw the scapula forwards. It is used strongly in push-ups and bench presses. Winged scapula are an indicator of having a weak Serratus Anterior muscle.
Daily uses include reaching up to open a high window. Simple strengthening exercise example - push-up or press up.
Origin - Upper nine ribs at the side of the chest and inserts at the costal aspect (side articulating with the ribs) of the medial border of the scapula.
Actions - Scapula protraction and rotation of the scapula upwards.
Innervation - long thoracic nerve.