Question

The amount of CSF in the cranial cavity is
A. 500 ml
B. 140 ml
C. 1 ml
D. 1.5 ml

Answer 1

Hint: Cerebrospinal fluid is a clear, colorless, transparent tissue fluid that fills the brain’s ventricles, and it serves as the main protective outer cushion within and all around the CNS.

Complete answer: Cerebrospinal fluid (CSF) is a clear, colorless liquid found in your brain and spinal cord.
1. The brain and spinal cord make up your central nervous system.
2. CSF is produced by the choroid plexus in the lateral, third, and fourth ventricles and circulates through the subarachnoid space, formed in the choroid plexus by both filtration and active transport.

3. The central nervous system primarily controls and coordinates everything we do which includes muscle movement, organ function, and even complex thinking and planning.
4. CSF helps protect this system by acting as a cushion against sudden impact or injury to the brain or spinal cord. CSF also removes waste products from the brain and helps your central nervous system work properly.
5. In normal adults, the CSF volume is about 125 to 150 ml.
6. It is estimated that about 20 percent of the CSF is contained in the ventricles, while the rest is contained in the subarachnoid space in the cranium and spinal cord.
7. The normal rate of CSF production is approximately 20 ml per hour.
8. The normal rate of CSF production is approximately 20 ml per hour.

So, the correct answer is B. 140 ml.

Note: The CSF contains certain proteins and few chemicals which are necessary for maintaining a healthy brain; in case the amount gets disturbed it leads to potential diseases such as Alzheimer’s disease (AD).