NHM UP Staff Nurse-2023 shift 1st
Applied Anatomy
Easy
Which of the following secretes the cerebrospinal fluid?
Appeared in: NHM UP Staff Nurse-2023 shift 1st
Explanation
- The choroid plexus is a highly vascularized structure located in the walls of the lateral ventricles and the roofs of the third and fourth ventricles of the brain.
- It is composed of ependymal cells, pia mater, and capillaries, and it is the primary site for the production and secretion of cerebrospinal fluid (CSF).
- The choroid plexus actively produces about 70% of the total CSF volume, which is constantly being circulated and reabsorbed.
- This structure also forms the blood-CSF barrier, regulating the composition of the fluid and removing waste products.
Why Other Options Were Wrong
- Option A: The cervical part of the spinal cord is a region through which CSF circulates in the central canal and subarachnoid space, but it does not have the specialized secretory tissue (choroid plexus) to produce CSF.
- Option C: Similar to the cervical region, the thoracic part of the spinal cord is surrounded by CSF for protection but is not involved in its production.
- Option D: The lumbar part of the spinal cord does not secrete CSF. This region is clinically significant as the site for a lumbar puncture (spinal tap), where a sample of CSF is collected for diagnostic purposes, precisely because it contains CSF but does not produce it.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy and physiology of the central nervous system, specifically the production of cerebrospinal fluid (CSF) as background academic context rather than a clinical decision trigger.
- Understanding CSF production is fundamental for nurses in assessing and managing patients with neurological conditions like hydrocephalus (excess CSF), meningitis (infection), or subarachnoid hemorrhage.
- Nurses monitor for signs of increased intracranial pressure (ICP), such as headache, nausea, vomiting, and changes in consciousness, which can result from an imbalance in CSF production, circulation, or absorption.
- A lumbar puncture is a common procedure where nurses assist in positioning the patient and monitoring them post-procedure. Knowledge of CSF helps in understanding the rationale and potential complications.
How to Approach the Question
- First, identify the key action word in the question, which is 'secretes'. This points to the origin or production site of a substance.
- The key substance is 'cerebrospinal fluid' (CSF). The question is asking where CSF is made.
- Recall the basic anatomy of the central nervous system (CNS), including the brain and spinal cord.
- Evaluate the given options. Three options are different segments of the spinal cord (cervical, thoracic, lumbar), and one is a specific structure (choroid plexus).
- Differentiate the function of these structures. The spinal cord is a pathway for nerve signals and is surrounded by CSF for protection. The choroid plexus is a specialized tissue within the brain's ventricles.
- Connect the function to the structure. The secretion of CSF is a specialized function performed by the choroid plexus, not the general tissue of the spinal cord.
Concept Tested & Keywords
- Concept Tested: Anatomy and physiology of the central nervous system, specifically the production of cerebrospinal fluid (CSF).
- Stem keywords: secretes, cerebrospinal fluid, CSF
- Lead-in keywords: Which
- Negative lead-in flag: false
Question ID
QV0UynffmhR64oVDxeVCZc
Reference Book
E6 Anatomy Grays 43e Vol 1 Part 3 p. 45-47
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
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.
More Nervous System Questions
- Which one of the following is the third cranial nerve?
- Identify the procedure done by the health care professional in the image below:
- Connection between right and left hemisphere is known as?
- A young adult who was hit by a car was fortunate because the level of his injury did not interrupt his respiratory function. The cord segment involve…
- Auditory area located in which lobe of the brain?
- Following a head injury, a person comes into the emergency department with personality changes and loss of voluntary control. Which lobe of the brain…
- Pressure by the upper end of a crutch may cause injury to the?
- Carpal tunnel syndrome is caused by the compression of?
- Which of the following is the largest cranial nerve?
- How many cervical nerves are there in the spinal cord?
More NHM UP Staff Nurse-2023 shift 1st Questions
- Absence of both the sacral alae in the pelvis is called:
- is defined as recurrent miscarriage.
- Which of the following is the largest diameter of pelvic brim?
- Which of the following is the presenting diameter in brow presentation?
- Which phase of the menstrual cycle starts on the first day of the cycle and lasts for 13 to 14 days, ending in ovulation?
- What is the bleeding pattern in placenta praevia?
- What is the normal length of the uterine cavity?
- What is the normal position of the uterus?
- Incidence is defined as the:
- The number of deaths over a given period divided by the person-years lived by the population over that period is expressed as the number of deaths pe…