Compléter Nervous System Version en ligne In this game you will be tasked with filling in the name of the correct meninges based on the definition given. par Kennedy Swift 1 Meningeal middle Mater dural Postiosteal meningeal layer meningeal Dura postiosteal layer Pia 2 inner Mater folds outer Arachnoid Mater The is the most layer and lays directly on the surface of the brain and attaches directly to the brain and spinal cord . It is filled with cerebrospinal fluid , and protects blood vessels . The is the layer that has a spider web like appearance . It possesses arachnoid trabeculae that projects into the pia mater and reabsorbs the CSF to the blood . , the most layer consist of layers the and the layers . The folds inward to form several double thickness sheets known as , which helps hold the brain in place . Lastly , the adheres to the internal surface of the cranium and for majority of its course lies directly touching the layer . Meningeal vessels course between this layer and the cranium .