Card 2 / 24: Watch this animation ( http://openstaxcollege.org/l/braindevel ) to examine the development of the brain, starting with the neural tube. As the anterior end of the neural tube develops, it enlarges into the primary vesicles that establish the forebrain, midbrain, and hindbrain. Those structures continue to develop throughout the rest of embryonic development and into adolescence. They are the basis of the structure of the fully developed adult brain. How would you describe the difference in the relative sizes of the three regions of the brain when comparing the early (25th embryonic day) brain and the adult brain? (http://openstaxcollege.org/l/hugebrain) in which the author explores the current understanding of why this happened.

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