Structure And Function Meninges Of The Brains
Meninges of the Brain (singular meninx) are the mebranes covering the brain and spinal cord which covered by 3 connective tissue layers collectively (pia meter, durameter and the arachnoid).
The function of meninges are Providing blood suply to the skull and to the hemispheres and also providing a space for the flow of cerebrospinal fluid.
The dura mater is the toughest and outermost layer of the meninges. If you have the chance to dissect a real brain, you will notice that the dura mater is indeed quite strong.
The pia mater is the innermost layer lining the brain. In fact, it completely lines every sulci and gyri of the hemispheres, contours the brainstem, and all the folds of the cerebellum. It is very tender (“pia” means “tender” in latin) and is very easily damaged while performing dissections.
The Arachnoid Mater : Over the pia mater and separated from it by a space called the subarachnoid space is a second meningeal envelope of the central nervous system, the arachnoid, a thin membrane remarkable for its delicacy and transparency. It is composed of fibrous tissue and, like the pia, is also believed to be impermeable to fluid.
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