What do grey and white matter in the brain represent?

Grey matter – The cerebral cortex is referred to as Grey matter due to its greyish appearance. It is the layer of cells covering the cerebral hemisphere and is thrown into prominent folds. There are neuron cell bodies concentrated, hence giving the grey colour.

White matter – Fibres of the tract are covered with myelin sheath. It constitutes the inner part of the cerebral hemisphere. They give an opaque white appearance to the layer.