Science & technology | Out of ’cyte, out of mind

Neurons are not the only brain cells that think

Astrocytes, for instance, may play a role in depression and anxiety

Hippocampus tissue. Light micrograph of a sagittal (side view) section through the hippocampus of the brain showing the nerve cells within it. The hippocampus is a structure of the limbic system of the brain. There is a hippocampus in each cerebral hemisphere, and they are thought to be responsible for spatial awareness and the formation of memories. Different structures have been stained different colours: the nuclei of cells are red, neurofilaments are blue and glial cells are green. Neurofilaments are proteins found in the axons (output processes) of nerve cells. Glial cells (neuroglia) are cells that support and nourish nerve cells. Magnification: x160 when printed 10cm wide.
Image: Science Photo Library

Most people, if they think about the matter at all, probably think of thinking as something done by the huge network of specialised, electrically conductive cells called neurons that occupies the upper half of their skulls. And, as far as it goes, that is true. The 86bn neurons in a human brain do indeed do much of the cognitive heavy lifting. But not all of it.

This article appeared in the Science & technology section of the print edition under the headline “The other brain cells”

From the January 28th 2023 edition

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