You evaluate a 63-year-old patient who has developed progressive muscle weakness and wasting over several months. Muscle fasciculations are diffusely evident on exam. Reflexes are rather brisk. Which...

You evaluate a 63-year-old patient who has developed progressive muscle weakness and wasting over several months. Muscle fasciculations are diffusely evident on exam. Reflexes are rather brisk. Which structure is most likely affected?

A. Peripheral nerves

B. Ventral roots