osteoid
anatomy
Quick Summary
osteosarcoma
A micrograph of an osteosarcoma, showing osteoid (immature bone; in pink) and a high density of cells with malignant features (tissue stained with hematoxylin and eosin).
Osteoid is the unmineralized organic matrix of bone, primarily composed of collagen and other proteins. It is secreted by specialized bone-forming cells called osteoblasts. This gelatinous substance serves as a framework upon which inorganic salts are deposited, leading to the hardening of bone through a process called mineralization. Osteoid is a crucial component in both initial bone formation and the continuous process of bone remodeling throughout life.123
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