**Core Concept**
The Node of Ranvier is a crucial structure in the nervous system that plays a vital role in the transmission of electrical signals. It is a gap in the myelin sheath that surrounds the axon of a neuron, allowing for the regeneration of the action potential.

**Why the Correct Answer is Right**
The Node of Ranvier is specifically located on the axon of a neuron, where the myelin sheath is interrupted. This interruption is essential for the proper functioning of the neuron, as it allows for the efficient transmission of electrical signals. The Node of Ranvier is the site where the action potential is regenerated, enabling the signal to propagate rapidly along the length of the axon. This process is made possible by the presence of voltage-gated sodium channels at the Node of Ranvier.

**Why Each Wrong Option is Incorrect**
**Option A:** The cell body, or soma, is the central part of the neuron where the majority of the cell's metabolic processes occur. It is not the site of the Node of Ranvier.
**Option B:** Dendrites are the branched extensions of the neuron that receive signals from other neurons. They do not have a Node of Ranvier.
**Option D:** Terminal buttons, also known as synaptic terminals, are the structures at the end of the axon where neurotransmitters are released. While they are critical for neurotransmission, they are not the site of the Node of Ranvier.

**Clinical Pearl / High-Yield Fact**
The Node of Ranvier is a key structure in the nervous system, and its proper functioning is essential for efficient neural transmission. Understanding the role of the Node of Ranvier can help clinicians appreciate the mechanisms underlying various neurological disorders.

✓ Correct Answer: C. Axons.