Why does peripheral neuropathy, resulting from unmanaged diabetes, primarily impair fine touch discrimination and proprioception in the feet before impacting pain or temperature sensation?

💡 Explanation

Peripheral neuropathy affects nerve fibers differently based on size; because large-diameter myelinated fibers, which transmit fine touch and proprioception information, have high metabolic demands, they are more vulnerable to damage from hyperglycemia. Therefore, fine touch is impaired first, rather than smaller pain/temperature fibers, due to differential metabolic vulnerability.

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