**Core Concept**
The first web space of the toes is supplied by a specific nerve that innervates the skin and muscles in this area. This nerve is a branch of the peripheral nervous system and plays a crucial role in sensation and motor function.

**Why the Correct Answer is Right**
The first web space of the toes is supplied by the medial plantar nerve, a branch of the posterior tibial nerve. The medial plantar nerve provides sensory innervation to the medial three and a half toes, including the first web space, and motor innervation to the muscles of the foot, such as the flexor digitorum brevis. This nerve is responsible for sensation and motor function in this area.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the lateral plantar nerve, a branch of the posterior tibial nerve, supplies the lateral one and a half toes, not the first web space.
* **Option B:** This option is incorrect because the sural nerve, a branch of the common peroneal nerve, supplies the lateral aspect of the foot, not the first web space.
* **Option C:** This option is incorrect because the deep peroneal nerve, a branch of the common peroneal nerve, supplies the anterior aspect of the foot, including the first dorsal web space, not the first web space of the toes.

**Clinical Pearl / High-Yield Fact**
The medial plantar nerve is a branch of the posterior tibial nerve, which is often compressed in patients with plantar fasciitis or tarsal tunnel syndrome, leading to pain and numbness in the first web space of the toes.

**Correct Answer: D**