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MENINGES & CSFBy: DR.KRUPA RAITHATHA
MPT. MUSCULOSKELETAL &SPORTS SCIENCESLECTURER AT SCHOOL OF PHYSIOTHERAPY, RK.UNIVERSITY,
RAJKOT,GUJRAT,INDIA.
MENINGES
Introduction• Brain is important but delicate
organ.• Protected by:-
o Bony covering of craniumo Three membranous covering (meninges):
1. Outer dura mater 2. Middle arachnoid mater3. Inner pia mater
• CSF fills space between arachnoid and pia(subarachnoid space) and acts as water cushion.
DURA MATER• TWO LAYERS:
o Outer –endosteal layer
o Inner meningeal layer,enclosing cranial venous sinuses between the two.
• meningeal layer forms 4 folds..
ARACHNOID MATER• Transparent
mater• Loosely surround
brain without dipping into sulci.
• Separeted fron dura- sub dural space
• Seperated from pia –sub arachnoid space.
• Provide sheath for cranial nerves
• Arachnoid villi are small,fingerlike process of arachnoid tissue, projecting into cranial venous sinuses.
• Absorbs CSF.
• In advancing age size increases, forms pedunculated tufts, called arachnoid granulations, which produces depression in bone.
PIA MATER• Thin vascular
membrane• Dipping into
various sulci and irregularities of bones.
• Better defined around the brainstem.
• Provides sheaths for cranial nerves.
• Provides perivascular sheaths.
• Folds of pia mater enclosing tufts of capillaries form the telachoroidea.
• Forms choroid plexus.
Extradural and subdural spaces
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Subarachnoid space
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Subarachnoid space• Space between
arachnoid and pia mater.
• It is traversed by network of arachnoid trabeculae which gives sponge like appearance.
• Surrounds brain and spinal cord.
• Ends at lower border of S2.
• Contains CSF, Large vessels of brain.
• Cranial nerves pass through the space.
• At base of brain and around the brainstem it forms intercommunicating pools, called cisterns.
• Arterial pulsation force CSF from cisterns on the surfaces of hemisphere.
• Forms cushions around medulla.
Comunications of subarachnoid space.
THANK YOU…
