The final, innermost part interacts, via cisterns filled with cerebrospinal fluid, with the organ that this complex protects.  
Its outermost component is separated into two layers, which create the trigeminal cave of Meckel containing the ganglion of Gasser.  This part lies above another membrane, which the ventricular system interacts with through the apertures of Magendie and Luschka.  This part gets its name from the cobweblike trabeculae that crisscross its space.  The final, innermost part interacts, via cisterns filled with cerebrospinal fluid, with the organ that this complex protects.  Composed of the dura mater, arachnoid, and pia mater, FTP, identify this connective tissue membrane that protects the brain.
Its outermost component is separated into two layers, which create the trigeminal cave of Meckel containing the ganglion of Gasser.  
meninges