A 9-year-old boy is diagnosed with multiple sclerosis (MS). Which of the following nervous structures would most likely be affected by this disease?
Correct Answer: Optic nerve
Description: Multiple sclerosis affects only axons in CNS (spinal cord and brain) that have myelin sheaths formed by oligodendrocytes. Optic nerve is considered to be pa of CNS, as it is derived from an outpouching of diencephalon. All other nervous structures are in the PNS and have their myelin sheaths formed by Schwan cells
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