A plan for--or a summary of--a writing project or speech. An outline is usually in the form of a list divided into headings and subheadings that distinguish main points from supporting points. Most word processors contain an outlining feature that allows writers to format outlines automatically.
Osteoblasts are bone-forming cells that descend from osteoprogenitor cells. They form a protein mixture known as osteoid, which mineralizes to become bone. Osteoid is primarily composed of Type I collagen.Osteoblasts also manufacture hormones, such as prostaglandins, to act on the bone itself.steocytes: Osteocytes are mature bone cells that originate from osteoblasts, which have migrated into and become trapped and surrounded by bone matrix, produced by themselves. The spaces they occupy are known as lacunae.
Cartilage cells form cells called OSTEOBLASTS. These cells produce bone matrix and once the cell is enclosed in bone matrix it is considered to be a mature bone cell and called an OSTEOCYTE; Growth in thickness of bone occurs as osteoblasts from beneath the periosteum produce bone matrix and build compact bone just underneath the periosteum