Abstract
The meninges are the membranes that envelop the brain and spinal cord and consist of three separate layers. The dura mater is the outer connective tissue layer, itself composed of an outer endosteal layer and an inner meningeal layer. The dura mater forms a double fold to create the falx cerebri (separates the cerebral hemispheres), tentorium cerebelli (separates the occipital lobes of the cerebrum from the cerebellum), falx cerebelli (separates the cerebellar hemispheres), and the diaphragma sellae (covers the pituitary gland). The middle layer, the arachnoid membrane, and the inner layer, the pia mater, together are referred to as the leptomeninges. Cerebrospinal fluid flows through the space between the arachnoid membrane and the pia matter (Schunke et al. 2007).
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