NHM UP Staff Nurse-2023 shift 1st
Applied Anatomy
Easy
Cerebrospinal Fluid (CSF) is formed in the choroid plexuses in which ventricles?
Appeared in: NHM UP Staff Nurse-2023 shift 1st
Explanation
- Cerebrospinal fluid (CSF) is actively secreted by the choroid plexuses.
- The choroid plexus is a vascular structure found in the walls of the lateral ventricles and the roofs of the third and fourth ventricles.
- Therefore, CSF is formed in the lateral, third, and fourth ventricles.
- The human brain has only four ventricles, making options with higher numbers anatomically incorrect.
Why Other Options Were Wrong
- Option A: This option is incorrect because the human brain does not have a 5th or 6th ventricle. There are only four ventricles in total.
- Option B: This option is incorrect as the human brain does not contain a 7th or 8th ventricle. The ventricular system consists of only four ventricles.
- Option C: This option is misleading and incomplete. The terms '1st and 2nd ventricles' are synonymous with the two lateral ventricles, making the phrase redundant. Crucially, it omits the 3rd and 4th ventricles, which also contain choroid plexuses and produce CSF.
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Anatomy of the ventricular system and cerebrospinal fluid (CSF) production helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- A blockage in the CSF pathway (e.g., at the aqueduct of Sylvius) can cause non-communicating hydrocephalus, leading to increased intracranial pressure (ICP). Nurses must monitor for signs of increased ICP, such as headache, vomiting, and changes in consciousness.
- CSF analysis via lumbar puncture is a key diagnostic tool for conditions like meningitis, subarachnoid hemorrhage, and multiple sclerosis. Nurses assist with this procedure and are responsible for post-procedure care, such as monitoring for headache.
- What if? If a tumor blocks the foramen of Monro on one side, only the corresponding lateral ventricle will enlarge, while the rest of the ventricular system remains a normal size. This is a critical finding on imaging that points to the exact location of the obstruction.
How to Approach the Question
- First, identify the core concept of the question, which is the anatomical location of CSF production.
- Recall the basic anatomy of the brain's ventricular system. Remember that there are four ventricles: two lateral, one third, and one fourth.
- Evaluate each option based on this anatomical knowledge. Immediately eliminate options that list non-existent ventricles (e.g., 5th, 6th, 7th, 8th).
- Analyze the remaining options for accuracy and completeness. Recognize that '1st and 2nd ventricles' is another name for the lateral ventricles, making that option redundant and incomplete.
- Select the option that correctly and completely lists all ventricles containing choroid plexuses, which are the sites of CSF production.
Concept Tested & Keywords
- Concept Tested: Anatomy of the ventricular system and cerebrospinal fluid (CSF) production.
- Stem keywords: Cerebrospinal Fluid, CSF, choroid plexuses, ventricles
- Lead-in keywords: formed in
Question ID
QAYZJ7yTBnCXcCKMRzf7mC
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. 207-209
E6 Anatomy Grays 43e Vol 1 Part 3 p. 45-47
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.
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