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What exactly is the Funny Bone?


When people hit their "funny bone" they are actually aggravating their ulnar nerve. It is the largest nerve in the body that is unprotected. It is also the only unprotected nerve that does not serve a sensory function.

Not only is hitting your funny bone not all that funny, the thing you hit isn't actually a bone. That's right, your funny bone is actually your funny ulnar nerve. The ulnar nerve runs through a groove your ulna, which is one of two bones in your forearm. The nerve is really close to the surface of your skin when it runs through your elbow. If you hit it, you'll get a really intense pins-and-needles sensation.



There are a few ideas about the origin of the name funny bone. One is that the weird sensation can make you laugh and cry at the same time. It gives off a mild pain and tingling through the forearm when it is hit. Another is that the ulnar nerve runs through your humerus bone (the bone in the top part of your arm).






A more detailed explanation of where the Ulnar Nerve is Located:

The Ulnar Nerve runs from the medial cord of the Brachial Plexus to the Inferior and medial Posterior part of the humerus, down the arm, posterior to the medial epicondyle and through the cubital tunnel of the elbow.

More About the Ulnar Nerve...

The ulnar nerve is known as the largest unprotected nerve in the human body (meaning unprotected by bone or muscle.) It is also the only unprotected nerve that does not primarily serve a sensory function. The ulnar nerve innervates a portion of the anterior forearm muscles, such as the medial part of the flexor digitorum profundus and all of the flexor carpi ulnaris. Most of the intrinsic hand muscles, such as the hypothenar muscles, the palmar and dorsal interossei, and the medial lumbricals are also innervated. This nerve receives skin sensations of the little finger and the medial half of the ring finger. It controls most of the hand’s little muscles that assist in fine movements. The ulnar nerve also controls some of the forearm’s bigger muscles that aid in a strong grip.