Haversian system is a diagnostic feature of ………

Explanation

**Step-by-Step Solution:**

1. **Understanding the Haversian System**: The Haversian system, also known as the osteon, is a structural unit of compact bone. It consists of a central canal surrounded by concentric rings of bone matrix.

2. **Components of the Haversian System**: The Haversian system is made up of Haversian canals, which are tiny tubes that contain blood vessels and nerve fibers. These canals are surrounded by layers of bone matrix known as lamellae.

3. **Identification of the Haversian System**: The presence of the Haversian system is a key feature that can be used to identify certain types of bones. When observing bone structure under a microscope, the Haversian system is distinctly visible in mammalian bones.

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