Spinal nerves c5-t1 make up the plexus.

C5-T1 (cervical 5, 6, 7, 8, and thoracic 1 spinal nerves) comprise a network called the Brachial Plexus, literally meaning "arm network."
This plexus controls both sensory and motor function of the entire upper extremity (shoulder, arm, forearm, wrist, and hand).

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