The acromial facet of the clavicle refers to which surface?

• A. The surface of the shoulder blade that articulates with the humerus
• B. The surface of the collarbone meeting the tip of the shoulder
• C. The edge where the clavicle meets the sternum
• D. The superior surface of the clavicle

Answer: (B)

This question tests knowing where the acromial facet sits on the clavicle and what it articulates with. The acromial facet is the articular surface on the lateral end of the clavicle, on its inferior aspect, that matches the acromion of the scapula to form the acromioclavicular joint. The option describing the surface of the collarbone meeting the tip of the shoulder correctly points to this articulation with the acromion, making it the best choice.

The other options describe different surfaces or joints: the surface of the shoulder blade that articulates with the humerus refers to the glenoid area of the scapula, not the clavicle; the edge where the clavicle meets the sternum is the sternoclavicular joint; and the superior surface of the clavicle is not the surface that contacts the acromion.