**Core Concept**
Little's area, also known as the Kiesselbach's plexus, is a vascular region in the anterior part of the nasal septum. It is a common site for nasal bleeding (epistaxis) due to its rich blood supply. Understanding the vascular supply of this area is crucial for managing nasal hemorrhages.

**Why the Correct Answer is Right**
The main vascular supply of Little's area is derived from four branches of blood vessels: the septal branch of the superior labial artery, the nasal branch of the anterior ethmoidal artery, the sphenopalatine artery's septal branches, and the branch from the greater palatine artery. However, the Palatal branch of the sphenopalatine artery primarily supplies the posterior part of the nasal cavity, including the nasal turbinates and the posterior septum, but not Little's area. This makes option D the correct choice.

**Why Each Wrong Option is Incorrect**
**Option A:** The septal branch of the superior labial artery is indeed a significant contributor to the vascular supply of Little's area, providing a major blood supply to this region.
**Option B:** The nasal branch of the anterior ethmoidal artery is another key supplier of blood to Little's area, playing a crucial role in its vascular network.
**Option C:** The anterior ethmoidal nerve is actually a branch of the nasociliary nerve, which is a branch of the ophthalmic nerve, and is not directly related to the vascular supply of Little's area.

**Clinical Pearl / High-Yield Fact**
It is essential for medical professionals to recognize the common sites of nasal bleeding and their underlying vascular supplies to provide effective treatment and management.

✓ Correct Answer: D. Palatal branch of sphenopalatine