## **Core Concept**
The nail bed of the index finger receives its nerve supply from branches of the **dorsal digital nerves** and **palmar digital nerves**, which are derived from the **median nerve** and **ulnar nerve**. Specifically, the sensory innervation of the index finger's nail bed is primarily provided by the palmar digital nerves.

## **Why the Correct Answer is Right**
The correct answer, , indicates that the nerve supply to the nail bed of the index finger comes from the **palmar digital nerve**, which is a branch of the **median nerve**. The median nerve divides into palmar digital nerves that provide sensory innervation to the palmar surface of the thumb, index, middle finger, and the radial half of the ring finger. The nail bed of the index finger receives its sensory supply from these palmar digital nerves.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because the **dorsal digital nerves**, primarily responsible for the sensory innervation of the dorsum of the hand and fingers, do not supply the nail bed of the index finger.
* **Option B:** - This option is incorrect because, although the **ulnar nerve** does provide sensory innervation to the little finger and the ulnar half of the ring finger, it does not supply the nail bed of the index finger.
* **Option D:** - This option is incorrect because it does not accurately represent the nerve supply to the nail bed of the index finger.

## **Clinical Pearl / High-Yield Fact**
A useful clinical pearl to remember is that the **median nerve** provides sensory innervation to the palmar surface of the thumb, index, middle finger, and the radial half of the ring finger through its palmar digital branches. This knowledge is crucial for assessing sensory deficits in the hand.

## **Correct Answer:** .