CerebroSpinalFluid Flashcards

1
Q

How is CSF produced?

A

In an active (ATP requiring) process.

Na pumped into subarachnoid space through Choroid Plexuses of ventricles
Water follows Na from the blood vessels into the ventricles

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2
Q

Where is most choroid plexus found?

A
  • Roof of Temporal Horns of Lateral Ventricles
  • Floor of Bodies of Lateral Ventricles
  • Roof of Posterior 3rd Ventricle
  • Roof of 4th ventricle
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3
Q

Through what foramen does CSF travel?

A
  • Foramen of Monro from lateral to 3rd ventricles
  • Foramen of Magendie from 4th ventricle to Spinal subarachnoid space (M is for midline)
  • Foramina of Luschka from 4th ventricle to cranial subarachnoid space (L is for lateral)
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4
Q

How much CSF is produced in the brain?

A

An adult makes 450-600 CCs of CSF every day
But only maintains ~150CCs in the brain at any point (~25 of which is in the ventricles)

So production = resorption

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5
Q

Where is CSF reabsorped?

A

Through Arachnoid villi within arachnoid granulations along the dural venous sinuses (mainly the sup sagittal)
Unlike production this is entirely passive

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6
Q

How do arachnoid villi work?

A

A passive process that is a group of pressure-dependant valves
Driven by pressure gradient between ICP & CVP

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