1) the axillary nerve (C5-C6; deltoid and teres minor) 2) the suprascapular nerve (C5-C6; supraspinatus and infraspinatus) 3) the subscapular nerve (C5-C6; subscapularis and teres major) 4) the medial and lateral pectoral nerves (C5-T1; major and minor pectorals) 5) the musculocutaneous nerve (C5-C7; coracobrachialis and long and short heads of biceps brachii) 6) the thoracodorsal nerve (C6-C8; latissimus dorsi) 7) the radial nerve (C5-T1; long and lateral heads of the triceps brachii)
The muscles innervated by the axillary and suprascapular nerves are the most clinically important for shoulder surgery
1)-3) and the major part of 4)-7) are anaesthetised by an interscalene brachial plexus block
Some of the muscle innervation of the shoulder from an anterior and a posterior view. Deltoid (blue, axillary nerve), teres major and minor (grey, subscapular and axillary nerve), long and short heads of biceps brachii (yellow, musculocutaneous nerve), long and lateral heads of triceps brachii (orange, radial nerve).
