How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Why is the gut called the second brain?
“The gut has its own nervous system with about 500 million neurons, which is why it's called the "second brain."”
Reference: Johns Hopkins Medicine
More from this shelf
How long is the small intestine?
The small intestine is about 20 feet long.
Which part of the brain is named after the seahorse?
The seahorse's genus name, Hippocampus, is also the name of a part of the brain, because of its similar shape.