What term describes the concentric rings of bone matrix around a single central canal in compact bone?

What term describes the concentric rings of bone matrix around a single central canal in compact bone?

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

Answer: (D)

This tests how compact bone is organized around the osteon. In each osteon, a central Haversian canal runs down the middle, containing blood vessels and nerves. Surrounding that canal are multiple circular layers of bone matrix called lamellae. The rings that form directly around the central canal are specifically known as concentric lamellae. Their arrangement, with sideways-aligned collagen fibers in each successive lamella, helps the bone resist twisting forces. By comparison, interstitial lamellae are older lamellae filling gaps between osteons; outer circumferential lamellae run along the outer surface of the bone, and the central canal is the channel itself, not a ring.

This tests how compact bone is organized around the osteon. In each osteon, a central Haversian canal runs down the middle, containing blood vessels and nerves. Surrounding that canal are multiple circular layers of bone matrix called lamellae. The rings that form directly around the central canal are specifically known as concentric lamellae. Their arrangement, with sideways-aligned collagen fibers in each successive lamella, helps the bone resist twisting forces. By comparison, interstitial lamellae are older lamellae filling gaps between osteons; outer circumferential lamellae run along the outer surface of the bone, and the central canal is the channel itself, not a ring.