A visual guide to the brain

Eliza Strickland reports at IEEE Spectrum how the brain’s 86 billion neurons do their work.

Image: USC Laboratory of Neuro Imaging/Athinoula A. Martinos Center for Biomedical Imaging/Consortium of the Human Connectome Project
When neuroscientists trace the connections between brain regions, they focus on networks of electrically active brain cells called neurons. These neurons link up with one another, sending electrical signals through complicated circuits that span the brain. Each of the human brain’s 86 billion neurons can connect to thousands of others.
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