Clavicle Bone Anatomy

• Thin and triangular, the scapula’s anterior costal surface is concave, forming the subscapular fossa. The vertebral (medial) border is marked by the inferior and superior angles. The posterior surface is distinguished by the horizontal scapular spine, which divides the scapula into the large infraspinous fossa below and the smaller supraspinous fossa above.

• On the lateral end of the scapular spine is the anteriorly projecting acromion process, which articulates with the clavicle. Projecting inferiorly and anteriorly to the acromion is the beak-shaped coracoid process. The infraspinous, supraspinous, and subscapular fossae merge on the axial border to form the glenoid fossa. Located below the acromion, this fossa articulates with the humeral head.