Which bone type forms the dense outer shell containing osteons?

Which bone type forms the dense outer shell containing osteons?

• A. Compact
• B. Spongy
• C. Cortical
• D. Trabecular

Answer: (A)

Compact bone forms the dense outer shell of a bone and is organized into osteons, or Haversian systems, with a central canal surrounded by concentric lamellae. This arrangement gives the shell its strength and rigidity, making it the load-bearing surface you feel on the outside of the bone. Spongy bone lies inside and is made of a lattice of trabeculae, lacking osteons. Cortical bone is another term for the same dense outer bone, but when describing the shell that contains osteons, compact bone is the precise term.

Compact bone forms the dense outer shell of a bone and is organized into osteons, or Haversian systems, with a central canal surrounded by concentric lamellae. This arrangement gives the shell its strength and rigidity, making it the load-bearing surface you feel on the outside of the bone. Spongy bone lies inside and is made of a lattice of trabeculae, lacking osteons. Cortical bone is another term for the same dense outer bone, but when describing the shell that contains osteons, compact bone is the precise term.