Final answer:
To test the C8 myotome, the patient can be asked to flex and extend the neck or shrug the shoulders against resistance. Lateral flexion of the neck toward the shoulder tests both at the same time. Any difference on one side versus the other would suggest damage on the weaker side.
Step-by-step explanation:
To test the C8 myotome, the patient can be asked to flex and extend the neck or shrug the shoulders against resistance. Lateral flexion of the neck toward the shoulder tests both at the same time. Any difference on one side versus the other would suggest damage on the weaker side. These strength tests are common for the skeletal muscles controlled by spinal nerves and are a significant component of the motor exam.