![]() Section through spinal chord showing the spinal tracts forming the white matter. 4) and the grey matter with parts that are processing information (fig. The white matter, again, is formed by various tracts (Fig. Section through spinal chord with central grey matter and surrounding white matter. In the spinal chord things are pretty much reversed grey matter within, white matter around it (Fig. However, the cortex has been expanding very late in evolution, so this 'endpoint reasoning' can be contested, because from an evolutionary perspective, more cortex was needed and hence it was expanded right where it happened to be, namely in the outer part of the brain. Since the cortex is the 'processor', it makes sense to connect the parts subcortically (more efficient as it leads to shorter connections). ![]() The white matter in the brain connects the various parts of the cortex so that information can be transported for further processing and integrated.įig. ![]() The Cortex is the place where all the higher mental processing takes place (Fig. In the brain, the gray matter is basically the cortex, the white matter lies mainly underneath it. Gray matter are cell bodies, white matter are myelinated fiber tracts. I'll tackle this question from a functional point of view.
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