Muscles acting on the shoulder (primarily the glenohumeral joint) Muscles of the scapula acting on the glenohumeral joint are primarily innervated by dorsal compartment nerves: the axillary nerve (Deltoid and Teres minor), suprascapular nerve (Supraspinatus and Infraspinatus), and upper (Subscapularis) and lower (Subscapularis and Teres major) subscapular nerves . The middle subscapular nerve, also known as thoracodorsal n., innervates Latissiumus Dorsi. Ventral compartment nerves, the medial and lateral pectoral nerves innervate pectoralis major. Muscle Origin Insertion Function Deltoid spine, acromion and clavicle (lateral 1/3) deltoid tuberosity of humerus flexes, extends, medially and laterally rotates and abducts (after 30 degrees) the brachium Rotator cuff muscles: all act to stabilize the head of the humerus in the glenoid cavity (= SITS muscles) S upraspinatus supraspinous fossa greater tubercle of humerus abduction of arm I nfraspinatus infraspinous fossa greater tubercle of humerus
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