False about CSF is
**Core Concept**
Cerebrospinal fluid (CSF) is a clear, colorless body fluid produced in the choroid plexuses of the ventricles in the brain. It plays a crucial role in maintaining the structural and functional integrity of the central nervous system (CNS) by providing buoyancy, shock absorption, and immune protection.
**Why the Correct Answer is Right**
CSF is produced at a rate of approximately 0.3-0.4 mL/min, with a total volume of about 125-150 mL. The CSF circulation is driven by a pressure gradient between the ventricles and the subarachnoid space, facilitated by the arachnoid granulations that reabsorb CSF into the venous system. The CSF composition is similar to that of plasma, but with lower protein and glucose concentrations.
**Why Each Wrong Option is Incorrect**
**Option A:** CSF is completely reabsorbed into the bloodstream through the lymphatic system. *This is incorrect because while CSF does have some lymphatic reabsorption, the majority is reabsorbed into the venous system through the arachnoid granulations.*
**Option B:** The CSF space is not a closed compartment. *This is incorrect because the CSF space is indeed a closed compartment, with minimal exchange of substances between CSF and the interstitial fluid of the brain and spinal cord.*
**Option C:** CSF is produced in the choroid plexus of the spinal cord. *This is incorrect because CSF is primarily produced in the choroid plexuses of the ventricles in the brain, with some production occurring in the central canal of the spinal cord.*
**Clinical Pearl / High-Yield Fact**
It is essential to remember that the normal CSF pressure is typically between 50-200 mmH2O, with a slight increase in pressure during coughing or straining.
**Correct Answer: C. CSF is produced in the choroid plexus of the spinal cord. CSF is primarily produced in the choroid plexuses of the ventricles in the brain, with some production occurring in the central canal of the spinal cord.*