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4-Part Evolutionary Human Brain

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Uploaded on Jun 29, 2008

A half century ago, Paul MacLean introduced the idea that the hu-
man brain consists of three main parts, and that the parts of our "Triune
Brain" correlate to the time sequence of their evolutionary emergence:
reptilian, paleo-mammalian, and neo-mammalian. Since then, scien-
tists have recognized that there is a fourth and far more recently evolved
mammalian structure, which is profoundly manifest in the human brain:
the prefrontal cortex, or frontal lobes. Let us begin with a brief overview
of each of the components of our Quadrune Brain.

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