The cerebral spinal fluid of the central nervous system sits on top of the pia mater (and underneath the arachnoid membrane). The pia mater is a very delicate membrane that adheres to the surface of the brain and spinal cord, following the contours (gyri and sulci) of the brain. These processes are very fine and look a bit like spider web fibers. The arachnoid mater got its name from the many processes that extend down from the membrane through the subarachnoid space to the pia mater on the brain surface. Image drawn by BYU-Idaho Student Spring 2014. The arachnoid membrane together with the cerebral spinal fluid helps to cushion the central nervous system and fits like a loose sac over it. This space, the subarachnoid space, is filled with cerebropinal fluid. The arachnoid mater is a very thin and transparent membrane that lies on top of a fluid filled space directly inferior to the membrane. These two membranes are not physically connected and there is a space (more like a virtual space) between the dura mater and the arachnoid mater. The arachnoid mater or arachnoid membrane is directly under the dura mater. The Falx cerebri separates the two cerebral hemispheres, the tentorium cerebelli separates the occipital lobes of the cerebrum from the cerebellum and the falx cerebelli separates the two cerebellar hemispheres.įrom Sobotta's Human Anatomy 1908. In certain areas these two layers separate and the meningeal layer forms folds that extend into the brain forming physical partitions in the brain. The dura mater of the brain is composed of two layers, an outer periosteal layer that connects to the inside of the skull, and a deep meningeal layer. The dura mater is a thick, tough, and durable membrane composed of dense fibrous connective tissue. Image was drawn by a BYU-Idaho student Winter 2014. The meninges consist of three layers: the dura mater, the arachnoid mater (membrane), and the pia mater. Part of the protective mechanism is found in the meninges which are membranes that envelop the central nervous system. The body goes to great lengths to feed and protect the central nervous system.
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