ANATOMY

Detailed explanation-1: -The shoulder girdle is composed of the clavicle and the scapula, which articulates with the proximal humerus of the upper limb. Four joints are present in the shoulder: the sternoclavicular (SC), acromioclavicular (AC), and scapulothoracic joints, and glenohumeral joint.

Detailed explanation-2: -The scapula articulates with the humerus and the clavicle. The scapula is flat and triangular. The scapula articulates with the humerus at the glenoid fossa and the clavicle at the acromion process.

Detailed explanation-3: -The shoulder bones include the scapula (shoulder blade), humerus (upper arm bone), and clavicle (collarbone).

Detailed explanation-4: -The scapula and clavicle articulate with the bones of the thorax at one point only, here, at the sternoclavicular joint. The lateral end of the clavicle articulates with this projection on the scapula, the acromion, forming the acromio-clavicular joint.

Detailed explanation-5: -The clavicle articulates at one end with the sternum (chest bone) and with the acromion of the scapula at the other. This articulation between the acromial end of the clavicle and the acromion of the scapula forms the roof of the shoulder.