Neurons, Hormones, and the BrainThalamusThe thalamusis a sensory way station. All sensory information except smell-related data must go through the thalamus on the way to the cerebrum. HypothalamusThe hypothalamuslies under the thalamus and helps to control the pituitary gland and the autonomic nervous system. The hypothalamus plays an important role in regulating body temperature and biological drives such as hunger, thirst, sex, and aggression. Limbic SystemThe limbic systemincludes the hippocampus, the amygdala, and the septum. Parts of the limbic system also lie in the thalamus and the hypothalamus. The limbic system processes emotional experience. The amygdala plays a role in aggression and fear, while the hippocampus plays a role in memory. CerebrumThe cerebrum, the biggest part of the brain, controls complex processes such as abstract thought and learning. The wrinkled, highly folded outer layer of the cerebrum is called the cerebral cortex. The corpus callosum
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