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The scapulohumeral muscles all originate on the scapula and insert somewhere on the humerus to act on the glenohumeral joint. Four of the six comprise the rotator cuff muscles (supraspinatus, infraspinatus, teres minor, and subscapularis).
Posterior
Anterior
ROTATOR CUFF MUSCLE
The supraspinatus muscle initiates arm abduction and can accomplish the first 15 degrees of abduction.
Supraspinatus
ROTATOR CUFF MUSCLE
The infaspinatus muscle, along with the other rotator cuff muscles, helps to stabilize the glenohumeral joint.
ROTATOR CUFF MUSCLE
The teres minor muscle lies inferior to the infraspinatus muscle and can be difficult to distinguish from that muscle.
ROTATOR CUFF MUSCLE
The subscapularis muscle is a triangular-shaped muscle. Unlike the other rotator cuff muscles, this muscle originates on the anterior scapula and inserts on the lesser tubercle of the humerus.
The deltoid muscle covers the shoulder, giving it its rounded appearance. It has anterior, middle, and posterior parts and thus has several functions at the glenohumeral joint.
Posterior deltoid
Middle deltoid
Anterior deltoid
The teres major muscle is not part of the rotator cuff. Instead, the teres major functions in conjunction with the latissimus dorsi muscle.