Final answer:
To test for thoracic outlet syndrome, a neurologist may perform strength tests on the muscles controlled by spinal nerves in the neck and shoulders.
Step-by-step explanation:
To test for thoracic outlet syndrome, a neurologist may perform strength tests on the muscles controlled by spinal nerves in the neck and shoulders. These tests involve flexing and extending the neck, shrugging the shoulders against resistance, and lateral flexion of the neck toward the shoulder. Any differences in strength or damage on one side compared to the other would suggest the presence of thoracic outlet syndrome.