what is the dura in the optic nerve
Dura mater (UK /ËdjÊÉrÉ ËmeÉªtÉr/ or US /ËdÊÉrÉ Ëmaetr/), ËmÃ¦tr or, dura is a thick membrane that is the outermost of the three layers of the meninges that surround the brain and spinal. Cord it is derived from. Mesoderm the other two meningeal layers are the arachnoid mater and the pia. mater