Which bone tissue forms the hard, dense exterior just under the outer membrane?

Which bone tissue forms the hard, dense exterior just under the outer membrane?

• A. Spongy bone
• B. Compact bone
• C. Endosteum
• D. Periosteum

Answer: (B)

Compact bone is the hard, dense exterior just under the periosteum. This tissue forms the sturdy outer shell of a bone, organized into osteons with concentric lamellae around a central canal that carries blood vessels and nerves. That dense arrangement provides great strength and resistance to bending, protecting the inner layers and supporting weight. Inside this outer shell lies spongy bone, which has a porous lattice and lighter structure. The inner surface is lined by the endosteum, while the outer surface is covered by the periosteum.

Compact bone is the hard, dense exterior just under the periosteum. This tissue forms the sturdy outer shell of a bone, organized into osteons with concentric lamellae around a central canal that carries blood vessels and nerves. That dense arrangement provides great strength and resistance to bending, protecting the inner layers and supporting weight. Inside this outer shell lies spongy bone, which has a porous lattice and lighter structure. The inner surface is lined by the endosteum, while the outer surface is covered by the periosteum.