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No nerve is truly "exposed" which means it is on the surface of the body as all are under the skin. However the ulnar nerve is probably the most exposed of the nerves in the body. It runs from the brachial plexus down to the forearm and to get here ut must go via the elbow. For some unknown reason this nerve passes around a structure of the humerus called the medial epicondyl and at that point has amost no pretection at all. This is the reason for the tingling sensation in the forearm when the elbow is knocked at certan angles, it stimulates the neurones to start firing randomly. And this snesation is what earner the humerus the name the funny bone not the fact that it is called the humerus.

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