Which test is commonly used to evaluate the integrity of the peripheral nervous system?

Electromyography (EMG) is the most appropriate choice for evaluating the integrity of the peripheral nervous system. EMG assesses the electrical activity of muscles at rest and during contraction, allowing for the detection of abnormalities that can indicate dysfunction in the peripheral nerves. By measuring the signals that nerves transmit to muscles, EMG can identify issues such as nerve compression, muscle diseases, and other peripheral neuropathies.

In contrast, Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) scans are primarily used for imaging anatomical structures. While they can provide valuable information about the central nervous system and can sometimes reveal issues affecting the peripheral nervous system (such as tumors or structural abnormalities), they do not directly assess nerve function or muscle electrical activity.

Positron Emission Tomography (PET) scans are used to observe metabolic processes in the body and are not specific to assessing the integrity or functionality of the peripheral nervous system. Therefore, EMG stands out as the specialized test that directly evaluates peripheral nerve function, making it the correct answer in this context.