Cortical bone microstructure, illustration 插畫檔

Illustration showing the structural organisation of compact bone, arranged from left to right and from superficial to deep. The left panel displays a macroscopic cross-section of bone tissue, demonstrating the dense outer compact bone and the inner spongy bone. The right panel presents a magnified schematic of compact bone, clearly delineating its fundamental structural unit, the osteon or Haversian system. The external surface is covered by the periosteum, which overlies the circumferential lamellae. Progressing inward, concentric Haversian lamellae encircle a central canal containing blood vessels and nerves. Osteocytes reside within lacunae situated between the lamellae and are interconnected by canaliculi to facilitate metabolic exchange