The posterior cord is a part of the brachial plexus. It consists of contributions from all of the roots of the brachial plexus.
The posterior cord gives rise to the following nerves:
| Name | Roots | Supplies |
| upper subscapular nerve | C5-C6 | subscapularis muscle of the rotator cuff |
| lower subscapular nerve | C5-C6 | teres major |
| thoracodorsal nerve | C6-C8 | latissimus dorsi muscle |
| axillary nerve | C5-C6 | sensation to the shoulder and motor to the deltoid muscle, the teres minor and the triceps brachii (long head) muscle |
| radial nerve | C5-C8, T1 | triceps brachii muscle, the brachioradialis muscle, the extensor muscles of the fingers and wrist (extensor carpi radialis muscle), supinator, and the extensor and abductor muscles of the thumb |
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