Which statement accurately describes Multiple Sclerosis pathology?

Which statement accurately describes Multiple Sclerosis pathology?

• A. Primary problem: Neuronal death and synaptic loss
• B. Primary problem: Loss of dopamine neurons
• C. Primary problem: Myelin destruction; System affected: CNS white matter; Cause: Autoimmune attack; Neuron death: Secondary, not primary
• D. Primary problem: Formation of Lewy bodies

Answer: (C)

This item centers on recognizing that Multiple Sclerosis is a demyelinating disease of the central nervous system. The key point is that the primary problem is destruction of myelin in CNS white matter, driven by an autoimmune attack on oligodendrocytes and myelin proteins. When myelin is damaged, the nerve fibers lose the speed and even feasibility of saltatory conduction, leading to the other neurological symptoms MS causes. Neuron death is not the initiating event in MS; it tends to appear later as an indirect consequence of chronic demyelination and axonal injury. In contrast, the loss of dopamine neurons or the appearance of Lewy bodies describe patterns seen in other disorders, not the core MS pathology.

This item centers on recognizing that Multiple Sclerosis is a demyelinating disease of the central nervous system. The key point is that the primary problem is destruction of myelin in CNS white matter, driven by an autoimmune attack on oligodendrocytes and myelin proteins. When myelin is damaged, the nerve fibers lose the speed and even feasibility of saltatory conduction, leading to the other neurological symptoms MS causes. Neuron death is not the initiating event in MS; it tends to appear later as an indirect consequence of chronic demyelination and axonal injury. In contrast, the loss of dopamine neurons or the appearance of Lewy bodies describe patterns seen in other disorders, not the core MS pathology.