Which is the protective membrane covering the brain and spinal cord?

Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-1)

Explanation

The meninges are the specific set of membranes that cover the central nervous system (CNS), which includes both the brain and the spinal cord.
These membranes provide physical protection, support blood vessels, and enclose the cerebrospinal fluid (CSF), which acts as a shock absorber.
The meninges consist of three layers: the outer dura mater, the middle arachnoid mater, and the inner pia mater.
Inflammation of the meninges is known as meningitis, a serious medical condition.

Option A: The peritoneum is the serous membrane that lines the abdominal cavity and covers its organs, not the brain and spinal cord.
Option C: The pericardium is the sac that specifically encloses the heart.
Option D: The pleura are the membranes that cover the lungs and line the thoracic cavity.

Visual 1: Diagram - An illustration showing the layers of the meninges (dura, arachnoid, and pia mater) in relation to the skull, brain, and subarachnoid space. This helps visualize the protective structure.
Visual 2: Chart - A comparative table showing different serous membranes (Meninges, Pericardium, Pleura, Peritoneum) and the organs they protect. This reinforces the location-specific function of each membrane.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Central Nervous System's Protective Coverings as background academic context rather than a clinical decision trigger.
Understanding the meninges is crucial for recognizing and managing meningitis, which is the inflammation of these layers, often due to infection. Symptoms include fever, headache, and neck stiffness.
A lumbar puncture (spinal tap) is a procedure where a needle is inserted into the subarachnoid space of the lower back to collect cerebrospinal fluid (CSF) for diagnostic testing. This procedure directly involves the meninges.
What if? - If a patient presents with a severe headache, fever, and nuchal rigidity (neck stiffness), the nurse should have a high index of suspicion for meningitis and prepare for immediate diagnostic workup, including a potential lumbar puncture, as it is a medical emergency.

How to Approach the Question

First, identify the key anatomical structures in the question: 'brain and spinal cord'.
Next, analyze the core function asked for: 'protective membrane'.
Recall the specific anatomical term for the membranes covering the central nervous system.
Evaluate each option: 'Peritoneum' (abdomen), 'Pericardium' (heart), and 'Pleura' (lungs) are all protective membranes, but for different body cavities/organs.
Select the option that specifically corresponds to the brain and spinal cord, which is 'Meninges'.

Concept Tested & Keywords

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Practise the full RRB Nsg. Superintendent-20 July 2019 (Shift-1)

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