Five nerves originate from the posterior cord of the brachial plexus: the superior subscapular nerve, the thoracodorsal nerve, the inferior subscapular nerve, the axillary nerve, and the radial nerve (Fig. 7.53).
All these nerves except the radial nerve innervate muscles associated with the shoulder region or the posterior wall of the axilla; the radial nerve passes into the arm and forearm.