**Question:** Nerve supply of nail bed of middle finger: March 2013 (c)

**Core Concept:** The middle finger has a specific nerve supply responsible for innervating the nail bed. In this question, we need to identify the relevant nerve.

**Why the Correct Answer is Right:**
The correct answer is **D**: The radial artery and its branches supply the nail bed of the middle finger.

The radial artery is a terminal branch of the brachial artery, a major artery in the upper limb. As it traverses the thumb side of the wrist, the radial artery gives off several branches to supply the skin and soft tissues of the thumb, index finger, and middle finger. Among these branches, the **dorsal digital artery** supplies the skin and soft tissues of the dorsal aspect of the finger, while the **palmar digital artery** supplies the skin and soft tissues of the palmar aspect of the finger.

The nail bed, however, is supplied by the **dorsal digital artery** and its branches, particularly the **anterior interosseous artery**. This artery is a branch of the radial artery and plays a crucial role in providing blood supply to the nail bed and other structures of the middle finger.

**Why Each Wrong Option is Incorrect:**
A. **B. C:** These options refer to nerves supplying the finger, not the nail bed. Nerve supply for the finger comes from the ulnar nerve, specifically the ulnar digital nerves.

B. **C:** The ulnar artery is the main artery responsible for the ulnar side of the hand and does not supply the middle finger. The radial artery, like option D, supplies the middle finger.

C. The ulnar digital nerves supply the finger, not the nail bed. The nail bed is supplied by the radial artery and its branches, specifically the anterior interosseous artery as described in option D.

**Clinical Pearl:** Understanding the anatomy of the arterial supply to the finger is crucial in clinical practice, particularly for surgeons, plastic surgeons, and hand therapists. Knowledge of the nail bed's arterial supply allows for proper planning and management of surgical procedures involving the middle finger.

**Correct Answer Explanation:**

D. The dorsal digital artery, specifically its branch the **anterior interosseous artery**, supplies the nail bed of the middle finger. This artery plays a vital role in supplying nutrition and oxygen to the nail bed, ensuring its health and functionality.

In summary, the nail bed of the middle finger is supplied by the radial artery, which branches off the radial artery. The anterior interosseous artery is a crucial branch of the dorsal digital artery and plays a key role in supplying the nail bed, ensuring its health and functionality.

Understanding this anatomy is essential in various surgical procedures involving the middle finger, as well as during hand therapy sessions. Adequate knowledge of arterial supply to the finger is crucial for surgeons, plastic surgeons, and hand therapists.