Concentric Lamellae around a Central Canal describe features of which bone organization?

Concentric Lamellae around a Central Canal describe features of which bone organization?

• A. Spongy Bone Osteons
• B. Compact Bone Osteons
• C. Trabeculae Without Osteons
• D. Periosteum

Answer: (B)

The main concept being tested is how compact bone is organized at the microscopic level. Concentric lamellae surrounding a central canal define an osteon, also called a Haversian system, which is the basic functional unit of compact bone. The central canal houses blood vessels and nerves, while the surrounding lamellae are layered rings of mineralized matrix with lacunae containing osteocytes positioned between the lamellae and connected by gap junctions through tiny canaliculi. This arrangement provides the strength and resilience needed to resist bending forces. In contrast, spongy bone is built from a network of trabeculae that lacks organized central canals and osteons, resulting in a lighter, more porous structure. Periosteum, on the other hand, is a fibrous membrane that covers the outer surface of bone, not part of the lamellar organization inside. Therefore, concentric lamellae around a central canal describe compact bone’s osteons.

The main concept being tested is how compact bone is organized at the microscopic level. Concentric lamellae surrounding a central canal define an osteon, also called a Haversian system, which is the basic functional unit of compact bone. The central canal houses blood vessels and nerves, while the surrounding lamellae are layered rings of mineralized matrix with lacunae containing osteocytes positioned between the lamellae and connected by gap junctions through tiny canaliculi. This arrangement provides the strength and resilience needed to resist bending forces.

In contrast, spongy bone is built from a network of trabeculae that lacks organized central canals and osteons, resulting in a lighter, more porous structure. Periosteum, on the other hand, is a fibrous membrane that covers the outer surface of bone, not part of the lamellar organization inside. Therefore, concentric lamellae around a central canal describe compact bone’s osteons.