Inside our heads sits the remarkable human brain, a frontier of biology that still holds many secrets. This incredible organ consists of 86 billion neurons connected by a staggering 100 trillion synapses, numbers so vast that they surpass the number of stars in the Milky Way.
Neurosciences on the rise
![The long, slender axons of neurons that terminate in the mouse superior colliculus — a part of the brain involved in sensation — glow blue and red after infection with fluorescent tracing viruses.](https://neurology.wustl.edu/app/uploads/2024/01/SC3KA_01R_5x-2048x1365-1-1024x683.jpg)
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