The musculocutaneous nerve innervates all flexors in the arm and the skin of the forearm.
The axillary nerve innervates the deltoid and teres minor muscles, which laterally rotates the arm.
The radial nerve innervates all extensors in the arm and forearm.
The median nerve innervates most flexors in the forearm and 5 hand muscles.
The ulnar nerve innervates 1-1.5 flexors in the forearm and the remaining hand muscles.
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