Cerebrospinal fluid

Summary of Cerebrospinal fluid
Daily, 500 milliliters of cerebrospinal fluid is generated by the epithelial cells of the choroid plexus. After flowing through the ventricles and the subarachnoid space, cerebrospinal fluid is gradually recycled into venous blood by one-way bulk flow through the arachnoid granulations. Cerebrospinal fluid is the solution that provides a protective, controlled environment for the brain.
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Cerebrospinal fluid
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Cerebrospinal fluid

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Diagnostically, cerebrospinal fluid can be sampled by performing a in the lumbar cistern.

Questions

USMLE® Step 1 style questions USMLE

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USMLE® Step 2 style questions USMLE

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Cerebrospinal fluid (CSF) is produced by the choroid plexus epithelium which is a component of the blood-brain barrier. CSF can be sampled directly by lumbar puncture. CSF fluid and blood serum contain many of the same molecules but concentrations vary between the two. Which of the following molecules are found at higher concentrations in the CSF as compared to blood?

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