![]() The grey matter contains the majority of neuron somas, making it appear tan with circulation but grey when prepared for examination outside of the body. This increased surface area is crucial for effective functioning as more neurons can be present in contrast to a brain with a flat surface. Besides this group of neuronal cells, the axons of grey matter are not heavily myelinated, unlike white matter, which contains a high concentration of myelin. The gyri and sulci, or ridges and grooves located in the brain, are present to increase surface area. The highest concentration of neuronal cells is in the cerebellum, which has more than the rest of the brain combined.
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