Multiple choice

With CSF all are true, except

  1. persistent leakage causes headache

  2. neutrophils are normally not present

  3. pH is less than that of blood

  4. secreted by the arachnoid villi
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CSF is produced by the choroid plexus, NOT the arachnoid villi. Arachnoid villi are the site of CSF absorption into the venous sinuses. The other statements are correct: CSF leakage does cause headache (low pressure headache), neutrophils are normally absent (predominantly lymphocytes and monocytes), and CSF pH is slightly lower (more acidic) than blood pH.

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