They are the different cellular structures found in bones.
A cell is the basic building unit of any tissue or organ. Like other organs, bone is also made up of these smaller units arranged to form the structure we see outward.
These cells have the function of forming hard and specialized tissues that, in turn, fulfill the anatomical position of supporting the body and containing some vital organs.
Origin of bone cells
The term mesenchymal refers to cells deep within the embryo during early development; some remain in the bone marrow but do not form blood cells. Hematopoietic cells from the liquid part of the bone marrow, and some of them circulate with the blood.
Bone cells make molecules (usual proteins) that communicate with other cells.
These molecules are called growth factors and cytokines. They act in nearby cells and are therefore considered local regulators. These factors control cell division (proliferation), differentiation, and survival.
The following types of bone cells are found in bone. Different types of bone cells are programmed for types of functions.
- Coating cells.
All these cell names begin with “OSTEO” because that’s the Greek word for bone.
They are large cells that dissolve bone. They come from the bone marrow and are related to white blood cells.
They are formed from two or more fusing cells, so osteoclasts usually have more than one nucleus. They are found on the surface of the bone mineral next to the dissolving bone.
They are the cells that form new bone. They also come from the bone marrow and are related to structural cells. They have only one core. Osteoblasts work as a team to build bone.
They make new bone called “osteoid” from bone collagen and other proteins. They then control the deposition of calcium and minerals. They are found on the surface of the new bone.
When the osteoblast team has finished filling a cavity, the cells become flat and look like pancakes. They line up on the surface of the bone. These old osteoblasts are also called lining cells.
They regulate the passage of calcium in and out of the bone and respond to hormones by producing particular proteins that activate osteoclasts.
They are cells within the bone. They also come from osteoblasts. Some osteoblasts become osteocytes as new bone forms, and the osteocytes surround themselves with new bone.
However, they are not isolated because they send out long branches that connect with the other osteocytes.
These cells can detect pressures or cracks in the bone and help direct where the osteoclasts will dissolve the bone.