"Ewww!" says TJ when he sees an actual human brain on display at the science museum, "I didn't realize how convoluted and wrinkly it would be." Because he can only see the outer layer of the brain, TJ is actually describing just the

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TJ is only able to see the outer layer of the brain, which is the cerebral cortex. The tectum, limbic system, and basal ganglia are not visible from the outside.

"Ewww!" Says TJ When He Sees an Actual Human Brain