Final answer:
To test the C6 myotome, muscle strength in biceps and wrist extensors is measured against resistance, and the biceps reflex is tested. Additionally, pronator drift may be observed for signs of upper motor neuron lesions.
Step-by-step explanation:
To test for the C6 myotome, one should assess the muscles that are innervated by the C6 nerve root. This testing typically involves muscle strength and reflex exams. For the C6 myotome, this includes testing the biceps and wrist extensor muscles by having the patient flex their arm at the elbow and extend the wrist against resistance; the biceps reflex is also tested. In addition, the examiner can check for pronator drift, where the patient extends both arms in front of the body with palms facing up, and closely observes if one arm drifts downward, which could indicate a possible upper motor neuron lesion.