Chapter 12: Nervous System (meninges)

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Pia mater

Meaning soft mother; it is the innermost membrane layer and is applied directly to the surface of the brain and spinal cord

Arachnoid layer

Meaning spiderlike; it is a thin, delicate layer attached to the pia mater by weblike filaments

Dura mater

Meaning tough mother; it forms a tough, fibrous sac around the central nervous system

Arachnoid layer

Middle membrane layer

Dura mater

Most external membrane layer

Pia mater

Most internal membrane layer

Subarachnoid space

Space between the arachnoid layer and the pia mater; it contains cerebrospinal fluid that cushions the brain from the outside

Subarachnoid space

Space between two innermost membrane layers

Subdural space

Space between two outermost membrane layers

meninges

The central nervous system is encased and protected by three membranes known as the ________.

three; connective tissue; brain and spinal cord (central nervous system)

The meninges are [number] layers of [type of tissue] membranes surrounding the [two terms].

Subdural space

Actual space between the dura mater and arachnoid layers


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