Where does this come from, and can I check it?

Around two hundred million axons cross the midline in the corpus callosum. The figure is taken from NCBI Bookshelf, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a human body fact?

Yes. It sits on the Human Body shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

A thick bundle of fibres links the two hemispheres

Around two hundred million axons cross the midline in the corpus callosum The corpus callosum is the largest white matter tract in the brain, connecting matching regions of the left and right hemispheres. It lets one side know what the other is doing, from movement planning to language. Studies of people born without it show that the hemispheres can still communicate by other routes. It sits in Mondo's human body collection, one of 200 facts that each trace back to the reference below.

Where this comes from

NCBI Bookshelf

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Science trivia

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Tags: brain, hemispheres, white-matter

A thick bundle of fibres links the two hemispheres: the short answers

Where does this come from, and can I check it?: Around two hundred million axons cross the midline in the corpus callosum. The figure is taken from NCBI Bookshelf, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.