What result would indicate a dysfunction in the C7 myotome during assessment?

In assessing the C7 myotome, the result that indicates dysfunction is the inability to extend the elbow. The C7 nerve root is primarily responsible for innervating the muscles that facilitate elbow extension, particularly the triceps brachii muscle. Therefore, if an individual is unable to extend their elbow, it suggests a compromise in the function of the C7 myotome, highlighting potential nerve root impairment or pathology in that specific area.

The other options, while related to different myotomes, do not directly indicate dysfunction in the C7 myotome. For example, wrist flexion is primarily associated with the C6 myotome, and poor hip flexion is linked to the lumbar nerve roots rather than cervical ones. Weakness in finger abduction typically involves the C8 and T1 myotomes, which control intrinsic muscles of the hand. Thus, the inability to extend the elbow serves as a clear indicator of dysfunction within the C7 myotome.