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Long Bone

Parts of Long Bone

Diaphysis or shaft

Two epiphyses or extremities

The diaphysis and epiphysis are separated by epiphyseal cartilages

Medullary canal

Bone marrow

Structure

Diaphysis - composed of compact bone

Medullary canal - contains bone marrow - yellow marrow and red marrow

Epiphysis consists of an outer covering of compact bone with cancellous bone inside.

Long Bone Growth

Bone grows in length by ossification of the diaphyseal surface of epiphyseal cartilages

The growth is completed when the cartilage is completely ossified and stop growing

Centres of ossification = concentrations of osteogenic cells - present in the diaphysis and epiphysis - ossification begins in these centres

Growth in thickness is by deposition of bone under the periosteum

Blood Supply

By a branch from one of the nearest arteries - called nutrient artery

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Embryology

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