Body & HealthFact
Most of your brain cells aren't in your cerebrum.
Your brain contains about 86 billion neurons, not the 100 billion long claimed. The distribution is the surprise: roughly 69 billion, or 80 percent, sit in the cerebellum, which makes up only 10 percent of the volume and coordinates movement. The cerebral cortex, responsible for language and planning, holds about 16 billion.
Useful: By cell count, movement is the most demanding job your brain does.
Source: doi.org