An image illustrating the density of astrocytes and neurons in the cerebral cortex.

Astrocytes are shown in red/yellow here. Surrounding neurons' cell bodies are labeled green. A large astrocyte cell body is seen to the right of the image, and throughout, small red dots reflect the processes of astrocytes, which are cut in section by this image. Methods for image collection are similar to that described in Nimmerjahn et al. 2004