The scapula is an important bone in the function of the shoulder joint. It engages in 6 types of motion, which allow for full-functional upper extremity movement including protraction, retraction, elevation, depression, upward rotation, and downward rotation.

What is the primary action of the scapula?

Action. The main actions are protraction and upward rotation of the scapulothoracic joint, moving the scapula forward across the thoracic wall. It also keeps the medial boarder and inferior angle of the scapula close to the thoracic wall.

What does a scapula protect?

The scapula protects the posterior (or back) of the chest, offering additional shielding to the rib cage and lungs.