Final answer:
The key nerves of the arm include the axillary nerve, median nerve, radial nerve, and ulnar nerve. These nerves are part of the brachial plexus.
Step-by-step explanation:
The key nerves of the arm include the axillary nerve, median nerve, radial nerve, and ulnar nerve. These nerves are part of the brachial plexus, which arises from spinal nerves C4 through T1. The axillary nerve branches off the radial nerve and goes to the armpit region, while the median nerve runs between the ulnar and radial nerves.
The axillary nerve is a systemic nerve of the arm that arises from the brachial plexus. The median nerve is another systemic nerve of the arm located between the ulnar and radial nerves. The ulnar nerve is a systemic nerve of the arm that is located close to the ulna, a bone of the forearm.