Lamellae

Definition

Lamellae are thin layers of bone matrix in compact bone tissue. They are arranged in concentric circles around central Haversian canals, providing structural support and strength.

5 Must Know Facts For Your Next Test

1. Lamellae are part of the osteon or Haversian system, which is the fundamental functional unit of compact bone.
2. Each lamella contains collagen fibers that run in different directions to resist torsional stresses.
3. Interlamellar spaces contain lacunae where osteocytes reside.
4. Lamellae can be classified into concentric lamellae (around Haversian canals), circumferential lamellae (near the periosteum), and interstitial lamellae (between osteons).
5. The arrangement of lamellae contributes to the bone's ability to withstand compressive forces.

Review Questions

• What role do lamellae play in the structure and function of compact bone?
• How are collagen fibers organized within each lamella, and why is this organization important?
• Differentiate between concentric, circumferential, and interstitial lamellae.

Related terms

Osteon: The basic unit of structure in compact bone, consisting of a central canal surrounded by concentric lamellae.

Haversian Canal: A channel within an osteon containing blood vessels and nerves essential for nutrient transport.

Lacunae: Small spaces between the lamellae that house osteocytes, facilitating communication through tiny canals called canaliculi.