Meningocele is protrusion of the meninges.
the membranes that cover the brain and spinal cord; there are 3 in mammals and 1 or 2 in submammalian forms.
There are actually three different functions of the meninges Protects the Central Nervous System Nourishes the brain Supports the channels carrying blood from the Brain to the Heart.
arachnoid matter
There are three layers (from outer to innermost) Dura Mater, arachnoid, and pia mater