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Indexed under : Life Sciences / Zoology

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Corpus callosum

The Corpus Callosum (Latin for 'tough body') is a large bundle of nerve fibres which serves to 'connect' the right and left hemispheres of the mammalian brain - except in marsupials (e.g. Kangarooo) and monotremes (e.g. Platypus).

Put another way, it's only found in 'placental' mammals (e.g. Humans)

Given that it's a crucial part of the brain for placental mammals (damage leads to a wide variety of very debilitating mental and physical symptoms) it remains unexplained why the marsupials and monotremes don't have it. Or why it has only evolved in placental mammals.

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