Cerebrospinal Fluid:
- The cerebrospinal fluid (CSF) is a clear watery nutritional fluid containing sodium chloride, potassium, glucose, and various proteins.
- It fills the space between the arachnoid and pia mater of the central nervous system (CNS), the ventricles of the brain and the central canal of the spinal cord.
- It is secreted by the choroid plexuses.
- In addition to providing nutritional supply to the brain, the CSF also removes by-products of metabolism and also serves to provide a fluid cushion to protect the brain from injury.
CSF is secreted by the choroid plexuses. Hence, the correct answer is option a.