“Humans have a 'funny bone' that is actually a bone.”

That distinct tingling jolt you feel when you bump your elbow isn't from hitting a bone, despite the common name 'funny bone.' This widespread misconception suggests there's a specific bone in your arm responsible for that peculiar sensation. In reality, what you're actually striking is not a bone at all, but rather the ulnar nerve, a major nerve that travels down your arm and provides sensation to parts of your hand and fingers.

The reason for the intense, often painful, and 'funny' sensation lies in the ulnar nerve's vulnerable position. As it passes through a groove on the inside of your elbow, it's relatively unprotected, running directly over the humerus bone. When you strike this area, you compress the nerve sharply against the bone, causing a sudden burst of electrical signals to shoot down your arm. This can lead to a mix of tingling, numbness, and sharp pain that travels all the way to your pinky and ring fingers.

The enduring myth likely stems from a combination of factors. The term 'funny bone' itself is a clever play on words, referencing the humerus bone it runs over, and also describing the strange, 'funny' feeling it produces. Because the sensation is so unique and memorable, and the term is so ingrained in common language, people rarely question the anatomical accuracy behind it. Most individuals aren't familiar with the intricate network (Review) of nerves in their arms, making it easy to attribute the feeling to a mysterious 'bone' rather than an exposed nerve.