Macrophage cells in the central nervous system are known as?

Appeared in: BSF Staff Nurse - 2015

Explanation

Microglia are the specialized phagocytic cells of the central nervous system (CNS), acting as its primary form of active immune defense.
They are derived from monocytes and migrate to the site of infection or injury, where they engulf pathogens and cellular debris.
Functionally, they are the macrophages of the CNS, playing a crucial role in brain inflammation and repair.

Option B: Astrocytes are star-shaped glial cells that provide structural support to neurons, help form the blood-brain barrier, and regulate the extracellular environment, but they are not the primary phagocytic/macrophage cells.
Option C: Neuroglia is a general, collective term for all the non-neuronal supporting cells in the nervous system, including microglia, astrocytes, and oligodendrocytes. It is not the specific name for macrophage cells.
Option D: Oligodendroglia, or oligodendrocytes, are responsible for producing the myelin sheath that insulates nerve axons within the CNS. They do not have a primary macrophage function.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of macrophage cells in the central nervous system as background academic context rather than a clinical decision trigger.
Understanding the role of microglia is crucial in neurodegenerative diseases like Alzheimer's disease and Parkinson's disease, where chronic microglial activation and neuroinflammation contribute to neuronal damage.
In conditions like multiple sclerosis, microglia are involved in both the destruction of myelin and the subsequent inflammatory response.
What if? If a patient has a brain infection, the microglia would become activated, changing their shape and migrating to the site of infection to phagocytose the invading microorganisms, a process essential for containing the infection but which can also cause collateral damage to healthy tissue.

How to Approach the Question

First, identify the key terms in the question: "Macrophage cells" and "central nervous system (CNS)".
The question is a direct recall of a specific cell type's function within the CNS.
Review the options provided. Each option is a type of glial cell (or a general term for them).
Recall the specific functions of each glial cell type.
Match the function 'macrophage' (immune defense, phagocytosis) with the correct cell. Microglia are known as the macrophages of the CNS.
Differentiate this from the other options: Astrocytes (support/BBB), Oligodendroglia (myelin), and Neuroglia (general term).

Concept Tested & Keywords

Concept Tested: Identification of macrophage cells in the central nervous system.
Stem keywords: Macrophage cells, central nervous system, CNS
Lead-in keywords: known as

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Practise the full BSF Staff Nurse - 2015

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