part of part of adjacent to adjacent to brain dura mater periosteum skull periosteal dura mater periosteal layer of dura mater outer layer of dura mater The outermost of the two layers of the cranial dura mater which normally always adheres to the periosteum of the bones of the cranial vault. outer periosteal layer of dura mater FMA:231547 endosteal layer of dura mater periosteal dura UMLS:C1518991 NCIT:C33306 UBERON:0010505 meningeal dura mater layer of dura mater