What part of the body does the ulnar nerve predominantly influence?

The ulnar nerve predominantly influences the little finger and the majority of the ring finger. This nerve is responsible for the sensation and motor function of these areas as it innervates the muscles used for fine motor skills in the hand. Specifically, it controls the movements of the intrinsic muscles of the hand, including those that allow for precise movements of the little finger, which is essential for grip and dexterity.

In contrast, other options involve fingers or areas that are primarily innervated by different nerves, such as the median nerve for the thumb and index finger. The palm of the hand, while also innervated by the ulnar nerve to some extent, is largely served by other nerves as well. Therefore, the emphasis on the little finger captures the primary role of the ulnar nerve, making it the correct answer.