## Core Concept
The covering on a peripheral nerve is layered, providing protection and support. These layers are crucial for nerve function and regeneration. The correct arrangement from inner to outer is essential for understanding nerve anatomy.

## Why the Correct Answer is Right
The correct arrangement of the layers covering a peripheral nerve from inner to outer is:
1. **Axon**: The innermost part, which carries the nerve impulses.
2. **Endoneurium**: A thin layer of connective tissue that surrounds the axon.
3. **Perineurium**: A thicker layer of connective tissue that surrounds a bundle of axons (fascicle).
4. **Epineurium**: The outermost layer, which surrounds the entire nerve.

This arrangement is critical for the protection and functioning of the nerve.

## Why Each Wrong Option is Incorrect
- **Option A:** Incorrect because it does not accurately represent the layers of a peripheral nerve.
- **Option B:** Incorrect as it misrepresents the order of the layers.
- **Option D:** Incorrect because it also does not accurately list the layers in the correct order from inner to outer.

## Clinical Pearl / High-Yield Fact
A key point to remember is the "3 Ps" for the layers of a peripheral nerve: **Endoneurium** (surrounds an axon), **Perineurium** (surrounds a fascicle), and **Epineurium** (surrounds the entire nerve). Understanding this helps in visualizing and recalling the structure.

## Correct Answer: C.