Question

CSF is secreted by

• A. choroid plexus only.
• B. Pia mater and choroid plexus only.
• C. Pia mater, choroid plexus and ependymal cells lining the ventricles.
• D. White matter, Pia mater and grey matter.

Hint:

Remember: CSF production $\rightarrow$ Choroid plexus
CSF circulation $\rightarrow$ Ventricles & spinal canal

Answer 1

The Correct Option is A

Concept: Cerebrospinal fluid (CSF) is a clear fluid that surrounds the brain and spinal cord, providing protection and nourishment.
• It is mainly produced by the choroid plexus located in the ventricles of the brain.
• Ependymal cells help in circulation but do not primarily secrete CSF.
• Pia mater is involved in protection but not in CSF secretion.

Step 1: Identify source of CSF.
The choroid plexus is a network of capillaries and specialized cells that produce CSF.

Step 2: Analyze options.
• (A) Choroid plexus: Correct
• (B) Pia mater + choroid plexus: Incorrect
• (C) Includes ependymal cells: Incorrect
• (D) Brain tissues: Incorrect

Step 3: Conclusion.
Thus, CSF is secreted only by the choroid plexus. Final Answer: Option (A)