Which nerve is responsible for supplying sensation to the thumb?

The median nerve is responsible for supplying sensation to the thumb. It primarily innervates the palmar aspect of the thumb, as well as part of the index and middle fingers. The median nerve plays a crucial role in the function of the hand because it contributes to both sensation and motor control, particularly for the flexor muscles of the thumb.

While the ulnar nerve has significant roles in innervating the little finger and a portion of the ring finger, and the radial nerve provides sensation to the back of the hand and thumb, it does not supply sensation to the thumb itself.

The digital nerves are branches of the median and ulnar nerves and are responsible for finer sensations in the fingers; however, they do not represent a distinct nerve responsible solely for the thumb's sensation. This makes the median nerve the accurate answer for providing sensation specifically to the thumb.