Purkinje fibres are nerve fibres supplying the ventricular muscles.

Explanation

**Step-by-Step Solution:**

1. **Understanding Purkinje Fibres**:
- Purkinje fibres are specialized fibres found in the heart. They are not nerve fibres; rather, they are modified cardiac muscle fibres.

2. **Location**:
- These fibres are located in the inner walls of the ventricles of the heart. This positioning is crucial for their function in the cardiac conduction system.

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