Saturday, 4 December 2010

Meninges - Membranes surrounding the brain and spinal cord

Dura Mater - Outermost layer

Tough, inflexible and 'leather like'.

Lines the inside of the skull where it's attached to the bones.

Arachnoid mater - Middle layer (separated from the pia mater by the subarachnoid space)

Delicate spider-web like structure

Attached to the inside of the dura

Surrounds the inside of the brain and spinal cord
(aracnoidea encephali & spinalis)

Pia mater - Delicate innermost layer

Thin / mesh like

Closely envelops entire surface of brain

Runs down fissures of the cortex

Supplies brain tissue with blood vessels

Subarachnoid space - Between arachnoid mater and pia mater is the CSF which absorbs and disperses excessive mechanical forces that might otherwise cause serious injury. It's produced by the choroid plexuses in the lateral ventricles and drains into the dural venous sinus into the internal jugular vein.

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