The 'funny bone' is not a bone at all: the shock comes from the ulnar nerve.
Why it is true
At the back of the elbow the ulnar nerve runs through a narrow channel protected only by skin and a little fat. A knock squeezes it against the bone and sends tingling and pain down to the ring and little fingers.
Source: Cleveland Clinic
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.
Related facts
The human body has about 60,000 km of nerves.
The headache from eating ice cream too fast is called sphenopalatine ganglioneuralgia.
Interoception is described as the human body's hidden sixth sense.
The human brain itself has no pain receptors, which allows awake brain surgery to be performed without causing pain to the brain tissue.
