Which dermatome corresponds to the deltoid area?

The deltoid area, which is located on the lateral aspect of the shoulder and is primarily responsible for arm abduction, corresponds to the C5 dermatome. The C5 nerve root plays a crucial role in providing sensory innervation to the skin over this region, which is why it is the correct answer.

Understanding dermatomes is important in determining areas of sensory loss in patients with nerve damage. The C4 dermatome primarily covers the upper chest and areas around the shoulders but does not extend as far laterally as the deltoid. The C6 dermatome encompasses the lateral aspect of the forearm and the thumb, while T1 covers the medial aspect of the arm and forearm. Thus, these options do not relate to the deltoid area, reinforcing that C5 is the specific dermatome associated with this location.