SCTIMST Staff Nurse - 2016
Applied Anatomy
Medium
The choroid plexus is situated in the brain?
Appeared in: SCTIMST Staff Nurse - 2016
Explanation
- The choroid plexus is a specialized tissue that produces the majority of the cerebrospinal fluid (CSF).
- It is located within all four ventricles of the brain: the paired lateral ventricles, the third ventricle, and the fourth ventricle.
- The largest volume and most extensive part of the choroid plexus is found within the two C-shaped lateral ventricles, which are located in the cerebral hemispheres.
- As seen in the provided diagram, the red-highlighted choroid plexus has its largest mass within the lateral ventricles.
Why Other Options Were Wrong
- Option A: The right ventricle is a chamber of the heart that pumps deoxygenated blood to the lungs. It is not part of the brain's ventricular system.
- Option C: The left ventricle is a chamber of the heart that pumps oxygenated blood to the rest of the body. It is not located in the brain.
- Option D: While the third ventricle does contain choroid plexus in its roof, the amount is significantly less than that found in the lateral ventricles. Therefore, 'Lateral ventricle' is the best answer as it is the primary site.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the ventricular system and location of the choroid plexus as background academic context rather than a clinical decision trigger.
- Understanding the location of the choroid plexus is crucial for diagnosing conditions like hydrocephalus, where CSF flow is obstructed, leading to increased intracranial pressure.
- Tumors of the choroid plexus (choroid plexus papillomas) can lead to an overproduction of CSF, also causing hydrocephalus.
- What if? If a patient has a blockage in the cerebral aqueduct, the lateral and third ventricles would enlarge due to the trapped CSF, while the fourth ventricle would remain a normal size. This is known as non-communicating hydrocephalus.
How to Approach the Question
- First, identify the key anatomical structure in the question: 'choroid plexus'.
- Recall the function and location of this structure. The choroid plexus produces CSF and is located in the brain's ventricles.
- Examine the options. Immediately eliminate 'Right ventricle' and 'Left ventricle' as they are chambers of the heart, not the brain.
- You are left with 'Lateral ventricle' and '3rd ventricle'. Both contain choroid plexus.
- To find the best answer, recall which ventricle contains the largest amount of choroid plexus. The lateral ventricles are the primary site of CSF production.
- Use the provided image to confirm. The visual representation clearly shows the largest mass of choroid plexus within the lateral ventricles.
Concept Tested & Keywords
- Concept Tested: Anatomy of the ventricular system and location of the choroid plexus.
- Stem keywords: choroid plexus, brain
- Lead-in keywords: situated in
Question ID
QPlfXSOPzZ5--jU2YA72Rp
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 SCTIMST Staff Nurse - 2016
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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