The human brain is the center of the human nervous system.
It has the same structure as the brains of other mammals,
but is larger than expected on the basis of body size among other primates.
Estimates for the number of neuronsin the human brain range from 80 to 120 billion.
Most of the expansion comes from the cerebral cortex, especially the frontal lobes,
which are associated with executive functions such as self-control, planning, reasoning, and abstract thought.
The portion of the cerebral cortex devoted to vision is also greatly enlarged in human beings,
and several cortical areas play specific roles in language,
a skill that is unique to humans.
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