What term describes the concentric rings surrounding the central canal in compact bone?

What term describes the concentric rings surrounding the central canal in compact bone?

• A. Lamellae
• B. Osteoblasts
• C. Trabeculae
• D. Canaliculi

Answer: (A)

The concentric rings around the central canal in compact bone are lamellae. In an osteon, the central Haversian canal houses blood vessels and nerves, and it is surrounded by several tightly packed rings of mineralized matrix—the lamellae. These layers are arranged in alternating directions of collagen fibers from one lamella to the next, which strengthens the bone and helps resist twisting forces. Osteoblasts are bone-forming cells that secrete bone matrix and eventually become embedded as osteocytes in lacunae; they aren’t ring-like structures around the canal. Trabeculae are the beam-like structures in spongy bone, forming a lattice rather than concentric rings. Canaliculi are tiny channels connecting osteocytes to each other and to the central canal, facilitating nutrient and waste exchange, not ring formations around the canal.

The concentric rings around the central canal in compact bone are lamellae. In an osteon, the central Haversian canal houses blood vessels and nerves, and it is surrounded by several tightly packed rings of mineralized matrix—the lamellae. These layers are arranged in alternating directions of collagen fibers from one lamella to the next, which strengthens the bone and helps resist twisting forces.

Osteoblasts are bone-forming cells that secrete bone matrix and eventually become embedded as osteocytes in lacunae; they aren’t ring-like structures around the canal. Trabeculae are the beam-like structures in spongy bone, forming a lattice rather than concentric rings. Canaliculi are tiny channels connecting osteocytes to each other and to the central canal, facilitating nutrient and waste exchange, not ring formations around the canal.