The three meninges of the brain work together to support and protect the brain, supply the brain with oxygen and nutrients it needs, and keep other things regularly found in the blood supply out of the brain. The three meninges are the dura mater, the arachnoid layer, and the pia mater. The dura mater is the thickest outer layer and is easy to peel off, like a banana. The arachnoid layer is the layer holding a web-like arragement of arteries just under the dura mater. The pia mater is the thinnest layer and is almost transparent and sits closest to the brain.

This is a picture of the meninges not yet removed from the brain