What area does the T1 nerve root primarily serve?

The T1 nerve root primarily serves the inside of the arm, particularly impacting the sensory function of the skin and potentially motor functions related to the muscles in that area. The T1 nerve root, which emerges from the spinal cord in the thoracic region, supplies sensation to the skin of the medial aspect of the arm and contributes to the function of the intrinsic muscles of the hand, particularly those that control fine motor skills and dexterity.

In contrast, options relating to other areas, such as the middle finger, radial wrist, or deltoid region, are associated with different nerve roots. The middle finger is primarily served by the C7 nerve root, which is responsible for the sensation in the middle digits of the hand. The radial wrist is dominated by branches stemming from the radial nerve, and the deltoid region is mainly innervated by the axillary nerve, which arises from the C5 and C6 nerve roots. Understanding the specific dermatomes and muscle innervations can help delineate the correct functions and areas served by each nerve root.