This image shows a group of neurons in a mouse’s brain. The whole group measures about the width of a human hair and is part of the brain’s somatosensory area, which maps senses to the part of the body where they were experienced. This is the part of the sensory system that tells you a pain is coming from your foot or that a friend’s tap is on your shoulder.

The 3-D image of a tiny proportion of the mouse brain’s 75 million neurons is a composite developed by cutting several hundred 30-nanometer-thick slices of mouse brain tissue. Each slice was then imaged in sequence using an electron microscope, according to the Howard Hughes Medical Institute. The stack of images was reconstructed in 3-D and colored to better visualize individual neurons and the connections between them.

Image courtesy: Daniel Berger, MIT. EM data from N. Kasthuri, R. Schalek, K. Hayworth, J.C. Tapia, and J. Lichtman/Harvard. Reconstruction and rendering by D. Berger and S. Seung at MIT.

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