Name the fluid that acts as a cushion for the components of the central nervous system.

Appeared in: NHM UP Staff Nurse-2023 shift 1st

Explanation

Cerebrospinal fluid (CSF) is the clear, colorless liquid that surrounds the brain and spinal cord.
A primary function of CSF is to act as a 'hydraulic shock absorber,' protecting the central nervous system from physical trauma and injury.
It circulates through the brain's ventricles and the subarachnoid space, providing both mechanical and chemical protection.
The buoyancy provided by CSF reduces the brain's effective weight, preventing compression of blood vessels and nerves.

Why Other Options Were Wrong

Option B: Synovial fluid is found in synovial joints (like the knee or shoulder), not the central nervous system.
Option C: Aqueous humour is the fluid located in the anterior and posterior chambers of the eye, in front of the lens.
Option D: Vitreous humour is the gel-like substance that fills the large space behind the lens in the eyeball (the posterior cavity).

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification and function of body fluids, specifically Cerebrospinal Fluid (CSF) as background academic context rather than a clinical decision trigger.
Analysis of CSF, obtained via a lumbar puncture (spinal tap), is a critical diagnostic tool for conditions like meningitis, encephalitis, subarachnoid hemorrhage, and multiple sclerosis.
An obstruction in the flow of CSF can lead to hydrocephalus ('water on the brain'), a condition characterized by an abnormal accumulation of CSF, which increases intracranial pressure and can cause brain damage.
What if? - If a patient's CSF appears cloudy or yellow (xanthochromic) and has a high white blood cell count and low glucose, a nurse should suspect bacterial meningitis and prepare for immediate antibiotic administration as per protocol.

How to Approach the Question

First, identify the key terms in the question: 'fluid,' 'cushion,' and 'central nervous system (CNS).'
The question is a direct recall of anatomical and physiological knowledge.
Consider each option and its primary location and function in the body.
Option A, Cerebrospinal fluid, is known to be associated with the brain and spinal cord (the CNS).
Options B, C, and D (Synovial fluid, Aqueous humour, Vitreous humour) are located in joints and the eye, respectively. Eliminate them as they are not part of the CNS.
Confirm that the primary function of CSF is indeed to cushion the CNS, which makes it the correct answer.

Concept Tested & Keywords

Concept Tested: Identification and function of body fluids, specifically Cerebrospinal Fluid (CSF).
Stem keywords: fluid, cushion, central nervous system
Lead-in keywords: Name
Negative lead-in flag: false

Question ID

Q4HnZpGlTsiVzFkRoP3rnM

Reference Book

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 209-211

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 121-123

Practise the full NHM UP Staff Nurse-2023 shift 1st

Attempt every question from this paper in a timed mock, then review the full solution for each one.

Attempt this paper Attempt in the NPrep app