protects central nervous system meningeal dura mater NCIT:C33093 not clear whether this should be classified as part of cranial dura mater, as the division only makes sense in this area FMA:231549 meningeal dura The inner layer of the dura mater surrounding the brain. It is mostly fused with the outer layer, the endocranium that is adherent to the inner aspect of the cranial bones. These two layers form the dura mater. The latter covers and protects the brain and the spinal cord. inner layer of dura mater UMLS:C1513121 UBERON:0010506 meningeal layer of dura mater layer of dura mater