Which nerve is responsible for sensation to the little finger and the medial half of the ring finger?

Which nerve is responsible for sensation to the little finger and the medial half of the ring finger?

• A. Median nerve
• B. Radial nerve
• C. Ulnar nerve
• D. Axillary nerve

Answer: (C)

The ulnar nerve supplies sensation to the little finger and the medial half of the ring finger. In the hand, the medial one-and-a-half digits receive cutaneous input from the ulnar nerve on both the palm and the surrounding dorsal areas. The median nerve covers the thumb, index, middle, and the lateral half of the ring finger; the radial nerve covers the dorsolateral aspect of the hand; the axillary nerve supplies skin over the deltoid region. So the described area exactly matches the ulnar nerve distribution.

The ulnar nerve supplies sensation to the little finger and the medial half of the ring finger. In the hand, the medial one-and-a-half digits receive cutaneous input from the ulnar nerve on both the palm and the surrounding dorsal areas. The median nerve covers the thumb, index, middle, and the lateral half of the ring finger; the radial nerve covers the dorsolateral aspect of the hand; the axillary nerve supplies skin over the deltoid region. So the described area exactly matches the ulnar nerve distribution.