Question

Fluid present in and around the central nervous system is
a. Cerebral fluid
b. Cerebrospinal fluid
c. Spinal fluid
d. Tissue fluid

Answer 1

Hint: Central nervous is a part of the nervous system, which consists of the brain and spinal cord, and it the main part which controls and coordinates the body, it controls, most of thee bodily movements such as thoughts, speech, memory, etc.

Complete answer:
- The fluid which is present in the central nervous system is cerebral spinal fluid (CSF).
- Cerebral spinal fluid is clear, colorless body fluid, which is present in and around the brain.
- CSF is produced by the ependymal cells of choroid plexus and ventricles.
- Almost 125 ml of CSF is present in the brain, at a time.
- While 500ml of fluid is generated every day.
- The cerebrospinal fluid acts as a cushion and buffer.
- The main function of the CSF is to give mechanical and immunological protection.
- It also helps in cerebral autoregulation of cerebral blood flow.
- CSF is present in arachnoid, subarachnoid space, and ventricles, in and out of the brain.
 -The majority of CSF fluid that is almost 150 ml is used to produce the lateral ventricles.
- Once it is produced in the lateral ventricles, it enters to third and fourth ventricles and to subarachnoid space.
- The movement of CSF in ventricles is unidirectional.
- While in subarachnoid space, the movement of CSF is multi-directional.

Hence, the correct answer is option (B).

Note: Apart from all the above things, the main important function of CSF is Buoyancy, The actual weight of the brain is 1400 to 1500gms, while because of CSF it appears as 20 to 25 gms, It allows the brain to maintain its buoyancy, without cut off the blood supply.