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Meninges and CSF Dr. K. Sivapalan. Meninges Dura mater, arachnoid mater and pia mater. Dura- single and tough layer of fibrous tissue fused with inner.

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Presentation on theme: "Meninges and CSF Dr. K. Sivapalan. Meninges Dura mater, arachnoid mater and pia mater. Dura- single and tough layer of fibrous tissue fused with inner."— Presentation transcript:

1 Meninges and CSF Dr. K. Sivapalan

2 Meninges Dura mater, arachnoid mater and pia mater. Dura- single and tough layer of fibrous tissue fused with inner periosteum except in few areas. Arachnoid- fibrocellular tissue. Outer most cells are bonded to each other by tight junctions. Subarachnoid space- arachnoid trabeculae cross the space to reach the pia. [CSF] Pia- invests the nervous tissue closely lining the outer surface. It and the sub- pial space follow into the tissue with blood vessols. Meningies and CSF2

3 Choroid Plexuses Choroid plexus is found in the 4 ventricles. Meningies and CSF3

4 CSF and ECF in Brain Meningies and CSF4

5 Circulation of CSF CSF enters the third ventricle through the inter ventricular foramen. It descends to the fourth ventricle through the aqueduct. It enters the subarachnoid space through median and lateral apertures in the roof of the fourth ventricle. Flow in the central canal of the spinal cord is negligible Some CSF descends through foramen magnum reaching the lumbar cistern in 12 hours. Small amount is absorbed into the spinal veins but most returns to subarachnoid space in cranium. It ascends further through the tentorial notch and around the cerebrum. Finally it is absorbed into the venous sinuses. CSF enters the third ventricle through the inter ventricular foramen. It descends to the fourth ventricle through the aqueduct. It enters the subarachnoid space through median and lateral apertures in the roof of the fourth ventricle. Flow in the central canal of the spinal cord is negligible Some CSF descends through foramen magnum reaching the lumbar cistern in 12 hours. Small amount is absorbed into the spinal veins but most returns to subarachnoid space in cranium. It ascends further through the tentorial notch and around the cerebrum. Finally it is absorbed into the venous sinuses. Meningies and CSF5

6 Function of the CSF Meningies and CSF6

7 Abnormalities of CSF Meningies and CSF7


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