Question

which part of the nervous system do neurologists treat?
the lungs
the muscles and joints
the brain, spinal cord, and peripheral nerves

Explanation:

Neurologists specialize in the nervous system. The lungs are treated by pulmonologists, muscles and joints by orthopedists or rheumatologists. The nervous system includes the brain, spinal cord, and peripheral nerves, so this is what neurologists treat.

Answer:

the brain, spinal cord, and peripheral nerves