Question

which of the following pathological conditions is due to the loss of myelin insulation around the nerves?
a radiculopathy
b multiple sclerosis
c myasthenia gravis
d shingles

Explanation:

• Radiculopathy is related to nerve root compression, not myelin loss.
• Multiple sclerosis is an autoimmune disease where the immune system attacks and destroys the myelin sheath around nerve fibers in the central nervous system.
• Myasthenia gravis is a neuromuscular disorder caused by problems at the neuromuscular junction (antibodies blocking acetylcholine receptors), not myelin - related.
• Shingles (herpes zoster) is a viral infection that affects nerves (reactivation of varicella - zoster virus), but it is not primarily about myelin loss.

Answer:

B. multiple sclerosis