Cutaneous innervations of dorsum of foot are marked in the given diagram. The area D supplied by
## **Core Concept**
The dorsum of the foot receives its cutaneous innervation from various nerves, primarily derived from the **peroneal nerves**, which are branches of the **common peroneal nerve**. The common peroneal nerve divides into the **superficial peroneal nerve** and **deep peroneal nerve**. The superficial peroneal nerve typically supplies the lateral and anterior aspects of the lower leg and the dorsum of the foot, except for the first web space.
## **Why the Correct Answer is Right**
The area marked D on the diagram, which corresponds to the first web space of the foot, is specifically innervated by the **deep peroneal nerve**. This nerve is responsible for supplying the muscles of the anterior compartment of the leg and the skin of the first web space of the foot. The deep peroneal nerve's cutaneous innervation is crucial for sensation in this specific area.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Incorrect because it does not accurately represent the nerve responsible for the cutaneous innervation of the area marked D on the diagram.
- **Option B:** Incorrect as it likely corresponds to another area of the foot or a different nerve supply.
- **Option C:** Incorrect because, although it might be related to the nerves innervating the foot, it does not specifically supply the area marked D.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the **deep peroneal nerve** supplies the skin of the **first web space** of the foot. This is a high-yield fact for clinical exams and can help in diagnosing conditions affecting the nerves of the lower limb.
## **Correct Answer:** .