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CSF is produced by the choroid plexus
in the ventricles.
CSF flows from lateral ventricles
and third ventricle
through the cerebral aqueduct
into the fourth ventricle.
CSF in the fourth ventricle
flows into the subarachnoid
space by passing through the paired lateral apertures
or the or the single median aperture,
and into the central canal
of the spinal cord.
As the CSF flows through the subarachnoid space
, it removes waste products and provides buoyancy to support the brain.
Excess CSF flows into the arachnoid villi,
then drains into the dural venous sinuses.
Pressure allows the CSF to be reeleased into the blood w/o permitting any venous blood to enter the subarachnoid space
The greater pressure on the CSF in the subarachnoid space ensures that the CSF moves into the venus sinuses.
All steps, quick view.
Choroid plexus -->
Third ((3rd) ventricle -->: (Through cerebral aqueduct)
Cerebral aqueduct -->
Fourth (4th) ventricle -->
Subarachnoid space --> (passes through lateral apertures)
Central canal of spinal cord -->
Arachnoid villi (excess flow) -->
(drains into) dural venous sinuses.
Questions to consider:
1) Which step involves removing waste products to provide buoyancy to support the brain?
2) Where does the excess CSF flow into?
3) What allows CSF to be released into the blood w/o permitting any venous blood to enter the subarachnoid space?
1) Step 4 (flow through subarachnoid space)
2) Excess flows into the arachnoid villi.
3) Pressure allows CSF to be released into the blood w/o entry into the subarachnoid space.
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