Microscopic Anatomy of Bone

At the ends of long bones

In the outer layer of bone

Beneath the periosteum

In the middle of the bone

Compact bone

Spongy bone

Spongy bone is denser than compact bone

Compact bone has a more porous structure

Spongy bone is found at the ends of long bones

Compact bone is primarily responsible for strength

Spongy bone has a lattice structure, while compact bone is dense.

Spongy bone is found in the outer layer, while compact bone is inside.

Spongy bone contains more blood vessels than compact bone.

Spongy bone is stronger than compact bone.

Compact Bone

Spongy bone

Spongy bone is made of concentric circles called lamellae.

Spongy bone contains spaces filled with marrow or blood vessels.

Spongy bone is the outermost layer of all bones.

Spongy bone is arranged in cylinders called osteons.

lamellae

osteocytes

Haversian canals

perforating canals

In the scapula

In bone marrow, located inside the bone

In the patella

In bone marrow, located inside the muscle tissue

Arranged in cylinders called osteons

Contains spaces filled with marrow

Lamellae surround a central canal

Connected by perforating (Volkmann's) canals

osteoblasts

osteoclasts

osteocytes

macrophages