Final answer:
To test the C8 dermatome, assess the sensory perception on the medial forearm and fingers using a cotton-tipped applicator, noting perceived sensations and any differences.
Step-by-step explanation:
To test for the C8 dermatome, you would examine the sensory perception in the medial surface of the forearm and extend out to the fingers. A simple method is to use the light touch of the soft end of a cotton-tipped applicator. The patient should be able to perceive the touch on their fingers or medial forearm. Sensory perception within the C8 dermatome is assessed from distal to proximal locations in the appendages, and it is essential to note any differences in sensation. This examination helps in mapping somatosensory responses and can indicate if there are any issues with the sensory pathways or cortex-based perception.