Transcript

Brains are broadly similar. There are two hemispheres, each covered by the deeply folded cortex. The cortex is sometimes known as the grey matter – the colour derives from the presence of the cell bodies.

The cortical folds create sulci – the valleys – and the gyri that form the crowns between the valleys.
Although the details of these folds vary, there are prominent folds that are found in most people. They create the familiar brain shape.

Underlying the cortex is the white matter. It contains the nerve tracts that link the cells of the cortex.