osteoid

(noun)

an organic matrix of protein and polysaccharides, secreted by osteoblasts, that becomes bone after mineralization

Related Terms

Examples of osteoid in the following topics:

  • Development of the Skeleton

    • These osteoblasts secrete osteoid against the shaft of the cartilage model (Appositional Growth).
    • Osteoblasts, differentiated from the osteoprogenitor cells that entered the cavity via the periosteal bud, use the calcified matrix as a scaffold and begin to secrete osteoid, which forms the bone trabecula.

  • Embryonic and Fetal Bone Formation

    • Separate mesenchymal cells differentiate into osteoblasts, which line up along the surface of the spicule and secrete more osteoid, increasing the size of the spicule.
    • The osteoblasts secrete osteoid against the shaft of the cartilage model (appositional growth).

  • Microscopic Anatomy of Bone

    • Bone matrix is laid down by osteoblasts as collagen, also known as osteoid.
    • Osteoid is hardened with inorganic salts, such as calcium and phosphate, by the chemicals released from the osteoblasts through a process known as mineralization.

  • Bone Development

    • The non-mineralized portion of the bone or osteoid continues to form around blood vessels, forming spongy bone.

  • Postnatal Bone Growth

    • Osteoblasts produce a matrix of osteoid, which is composed mainly of Type I collagen.