The transparent, fibrous membrane that forms a tube around and adheres to the surface of the brain and the spinal cord is called the Pia Mater.
Pia Mater is a medieval Latin word that means "tender mother". It is one of the three membranes that envelope the brain and the spinal cord called the Meninges. They are the dura mater, arachnoid mater and the pia mater.
Out of the three meninges, the pia mater is the innermost layer. It is a thin, transparent and fibrous connective tissue and is permeable to water and small solutes. It also allows the passage of blood vessels to nourish the brain and spinal cord and supply the brain and spinal cord with oxygen.
Meningitis occurs when the pia mater becomes irritated or inflamed.
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