L21 Meninges and Ventricular System

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Vocabulary flashcards based on lecture notes about the meninges, ventricular system, and cerebrospinal fluid (CSF).

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21 Terms

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Meninges

Protective covering for the brain consisting of three layers: dura mater, arachnoid, and pia mater.

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Dura mater

The outermost, tough, and fibrous layer of the meninges. It has two layers and space between them forms venous sinuses in some places. The inner layer forms the dural folds.

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Dural folds (seperating membrane)

Formed from the inner layer of the dura mater, separate major divisions of the brain, and provide stability within the cranium.

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Falx cerebri

A dural fold that separates the cerebral hemispheres in the median plane.

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Falx cerebelli

A dural fold that separates the cerebellar hemispheres in the median plane.

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Tentorium cerebelli

A dural fold that separates the cerebrum from the cerebellum in the horizontal plane.

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Venous sinus (Dura mater)

Located where the two layers of dura mater separate. They collect venous (used) blood from the brain and 'old' CSF.

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Arachnoid mater (spider like)

The middle layer of the meninges, beneath the dura mater and above the pia mater. It contains the subarachnoid space, arachnoid granulations, and arachnoid trabeculae. Does NOT extend into sulci.

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Subarachnoid space

The space between the arachnoid and pia mater, filled with cerebrospinal fluid (CSF) and blood vessels.

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arachnoid trabeculae

Support beams of the subrachnoid space.

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Arachnoid granulations

Pierce the inner layer of the dura mater and transport 'old' CSF from the subarachnoid space into the venous sinus.

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Pia mater

The innermost, transparent, and delicate layer of the meninges. Adheres to the brain, follows gyri and extends into sulci. Blood vessels in the arachnoid sit on top of pia mater.

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Ventricular system

A network of interconnected spaces (=ventricles) within the brain, filled with cerebrospinal fluid (CSF) and lined with ependymal cells (circulate CSF).

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Lateral ventricles

Two ventricles, one in each cerebral hemisphere.

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Third ventricle

A ventricle located in the diencephalon.

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Cerebral aqueduct

Connects the third ventricle to the fourth ventricle and is located in the midbrain.

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Fourth ventricle

A ventricle located at the level of the cerebellum.

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Central canal

Located within the spinal cord and is part of the ventricular system.

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Cerebrospinal fluid (CSF)

Produced by the choroid plexus within the ventricles, surrounds the CNS within the subarachnoid space, provides support and cushion, and transports nutrients and waste.

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Choroid plexus

Produces CSF; Epithelial cells of this make up the blood/CSF barrier.

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CSF circulation path

starts at lateral ventricals, 3rd ventricle, cerebral aqueduct, 4th ventrical, to subarachnoid space. Once there it flows around brain and spinal chord. Exits through arachnoid granulations to venous sinus.