What is the primary function of the scapula?

The primary function of the scapula, or shoulder blade, is to connect the arm to the trunk of the body, making the answer that choice correct. This connection is vital for the mobility and stability of the shoulder joint, allowing for a wide range of arm movements that are essential for various activities such as lifting, throwing, and pushing.

The scapula serves as an attachment point for multiple muscles that control arm movement, including the rotator cuff muscles. These muscles stabilize the shoulder joint and enable precise movements of the arm. Additionally, the scapula allows for the transfer of forces between the upper limb and the axial skeleton, enhancing the overall functional capacity of the arm.

The other options do not accurately describe the primary role of the scapula. The scapula does not directly support the thoracic vertebrae, protect the clavicle, or play a primary role in facilitating breathing, which involves different structures and mechanisms within the thoracic cavity.