💢تشريح العصبي 18
#Anatomy_of_CNS 18
#CNS
Menings covers 1-Brain 2-spinal cord ..
Its comes from mesoderm layer.
It extends from forman magnum to sacrum and coccgyus..
It consits of three layers
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1⃣😊Pia matter ..
☠it forms inner most layer of menings.
☠closly surounds the brain and is carried to all sulci by the branches of cerebral arteries which nourish the brain.
☠it's a fibrous tissue impermeable to brain encloses CSF.
☠periventicular space created between blood vessels and pia mater function as lymphatics.
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2⃣😊Archnoid matter ..
☠thin delicate membrane C. T lying outside the pia matter.
☠it sends sheats around the cranial nerves and their pints outside the skull.
☠it covers the gyri and bridges over the sulci of the brain.
☠it forms archnoid villi "microscopic" they are projection of archnoid into some of venous sinuses. And many of these colloction forms archnoid granulation are "macroscopic " which forms superior sagittal and transfarse sinuses pouring CSF into them.
☠subarchnoid spaces :-
They are areas in which archanoid and pia mater are widly seprated from each other.
🌟cerebllo medullary cistern
🌟pontaine cistern
🌟interpendular cistern
🌟latral sulcus
🌟corpous callosoum cistern
🌟great cerebral vein cistern
🌟chiasmatic cistern
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3⃣😊Dura mater :-
Is a thick membrane forming the outermost covering of the brain ..
☠it consists of :-
Outer endosteal layer "periosteal layer "
inner meningeal layer .
☠Dura mater modification :-
🌟falx cerebri
🌟falx cerebelli
🌟tentorium cerebelli
🌟diaphragma sellae
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