develops from has potential to develop into dura mater future meninx ectomeninx EHDAA2:0004317 UBERON:0007647 The outermost layer of the mesenchymal capsule that surrounds the developing brain, of mixed paraxial mesoderm and neural crest origin. The ectomeninx forms the dura mater (both inner layer and outer chondrogenic layer). ectomeninx future dura mater head paraxial mesoderm