Saltatory conduction is associated with those nerve fibres that have nodes of Ranvier.

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Saltatory Conduction**:
- Saltatory conduction refers to the process by which nerve impulses jump from one node of Ranvier to another along myelinated axons. This jumping mechanism allows for faster transmission of electrical signals compared to continuous conduction along unmyelinated fibers.

2. **Role of Myelin Sheath**:
- The myelin sheath is a fatty layer that surrounds the axon of many neurons. It acts as an electrical insulator, preventing the loss of electrical signals and increasing the speed of conduction.

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