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Which layer of meninges is filled with cerebrospinal fluid?

Answer 1

The Subarachnoid space between the Pia Mater and Dura Mater is filled with cerebrospinal fluid.

The Central Nervous System (CNS) is composed of the Brain and Spinal Cord, both of which are surrounded and protected by the Meninges. The Dura Mater ("Tough" Mother) is a Dense Epithelial tissue sac enclosing the CNS. The inner lining of the Dura Mater is called the Arachnoid Matrix which secretes the Cerebrospinal fluid.

Tightly bound to the CNS is the Pia Mater ("Tender" Mother) a thin highly vascularized protective membrane. Between the Dura Mater and the Pia Mater is a web of connective fibers known as the Subarachnoid space which is filled with the cerbrospinal fluid that cushions the CNS and aids in immune response for the brain and spinal cord.

This image is from Walter Crane of CSU Chico

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Answer 2

Josiah Austin

The subarachnoid space, which is the middle layer of the meninges, is filled with cerebrospinal fluid.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.