Osteons

Definition

Osteons are cylindrical structures that form the functional unit of compact bone. They consist of concentric layers of calcified matrix and house blood vessels and nerves.

5 Must Know Facts For Your Next Test

1. Osteons are also known as Haversian systems.
2. They contain a central canal called the Haversian canal, which houses blood vessels and nerves.
3. Osteocytes, the mature bone cells, reside in small spaces called lacunae between the concentric lamellae.
4. Canaliculi are tiny channels that connect lacunae to each other and to the central canal, allowing nutrient and waste exchange.
5. The orientation of osteons helps bones resist mechanical stress and enhances their strength.

Review Questions

• What is another name for osteons?
• What structures are found in the central canal of an osteon?
• How do osteocytes within an osteon communicate with each other?

Related terms

Lamellae: These are concentric rings of calcified matrix found in osteons.

Haversian Canal: The central channel within an osteon containing blood vessels and nerves.

Canaliculi:

Small channels connecting lacunae within an osteon, facilitating communication between osteocytes.