The biggest, most detailed map yet made of brain cells

It is part of a fly’s brain, but other brains will follow


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  • 01 23, 2020
  • in Science and technology

AT THE BEGINNING of the 20th century Santiago Ramón y Cajal, a Spanish neuroscientist, became known for his exquisite drawings of the branching, treelike cells of the brain and spinal cord. In 1906 he was awarded a Nobel prize for this work, which gave the world its first glimpse into the structure of these neurons, and an inkling of how they are arranged in an animal’s central nervous system.A century later Cajal’s legacy—supercharged by modern microscopy, heavy-duty robotics and a dollop of machine learning—is thriving. The objective now is to create connectomes. These are three-dimensional maps of all the neurons in entire brains, and how those neurons link together. This week sees the publication of an important step on the road to a complete brain connectome: a map of about a quarter of a fruit fly’s cerebral capacity.

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