Scientists produce painstaking wiring diagram of a mouse’s brain

Neuroscientists have produced the largest wiring diagram and functional map of a mammalian brain to date using tissue from a part of a mouse’s cerebral cortex involved in vision, an achievement that could offer insight into how the human brain works.

They worked out the cerebral architecture in a tissue sample the size of a grain of sand bearing more than 200,000 cells including roughly 84,000 nerve cells, called neurons,