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What part of the placental mammal brain is absent in marsupials?
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marsupial
Red kangaroo (Macropus rufus). The home range of this species spans much of Australia's interior, and it is the largest member of the family Macropodidae.
The part of the placental mammal brain that is absent in marsupials is the corpus callosum.
In placental mammals, this bundle of nerve fibers serves as the primary connection between the left and right cerebral hemispheres, facilitating rapid communication between them. In contrast, the marsupial brain is characterized by a simpler structure that lacks this specific connection, which is one of the notable anatomical differences between the two groups.1