06/02/2026
Clavicle (collar bone) – the long bone at the top of the shoulder
Acromion – the bony projection of the scapula that meets the clavicle
Acromioclavicular (AC) joint – the joint between clavicle and acromion
Scapula (shoulder blade) – the flat bone behind the shoulder
Glenoid cavity – the socket part of the shoulder joint
Head of humerus – the round upper part of the arm bone
Shoulder (glenohumeral) joint – joint between humerus and scapula
Ribs – bones of the chest seen in the background