External callus of bone or cartilage is formed by osteoprogenitor cells of the periosteum. Cells form bone in areas of high vascularity and form cartilage in areas of low vascularity. As new capillaries grow, new bone replaces cartilagenous callus. Internal callus is formed by osteoprogenitor cells of endosteum and is primarily new bone because of high oxygen tension.
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This Illustration was Published In
Netter's Essential Histology
Author: William K. Ovalle, Patrick C. Nahirney
Chapter: Cartilage and Bone
Page: 154
Author: William K. Ovalle, Patrick C. Nahirney
Chapter: Cartilage and Bone
Page: 154
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