Which lamellae surround the outer surface of compact bone?

Which lamellae surround the outer surface of compact bone?

• A. Central canal
• B. Interstitial lamellae
• C. Outer circumferential lamellae
• D. Periosteum

Answer: (C)

Lamellae that encircle the outer surface of compact bone are the outer circumferential lamellae. These rings lie just beneath the periosteum and wrap around the entire bone, forming a layer that adds diameter-wise strength and helps resist twisting. The central canal is the hollow channel inside an osteon, not the outer edge. Interstitial lamellae are the remnants of old osteons between newer ones, not a continuous outer coating. The periosteum is the outer connective tissue cover of bone, not a lamellar layer itself.

Lamellae that encircle the outer surface of compact bone are the outer circumferential lamellae. These rings lie just beneath the periosteum and wrap around the entire bone, forming a layer that adds diameter-wise strength and helps resist twisting.

The central canal is the hollow channel inside an osteon, not the outer edge. Interstitial lamellae are the remnants of old osteons between newer ones, not a continuous outer coating. The periosteum is the outer connective tissue cover of bone, not a lamellar layer itself.