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An osteoclast is a large multinucleated cell and human osteoclasts on bone typically have four nuclei [5] and are 150–200 μm in diameter. When osteoclast-inducing cytokines are used to convert macrophages to osteoclasts, very large cells that may reach 100 μm in diameter occur. These may have dozens of nuclei, and typically express major ...
Osteoclasts break down bone tissue, and along with osteoblasts and osteocytes form the structural components of bone. In the hollow within bones are many other cell types of the bone marrow . Components that are essential for osteoblast bone formation include mesenchymal stem cells (osteoblast precursor) and blood vessels that supply oxygen and ...
Bone tissue is removed by osteoclasts, and then new bone tissue is formed by osteoblasts. Both processes utilize cytokine (TGF-β, IGF) signalling.In osteology, bone remodeling or bone metabolism is a lifelong process where mature bone tissue is removed from the skeleton (a process called bone resorption) and new bone tissue is formed (a process called ossification or new bone formation).
The RANKL-RANK-OPG axis (OPG stands for osteoprotegerin) is an example of an important signaling system functioning both in bone [6] and immune cell communication. RANKL is expressed on osteoblasts and activated T cells, whereas RANK is expressed on osteoclasts, and dendritic cells (DCs), both of which can be derived from myeloid progenitor cells.
When the gap between the bone ends is less than 0.01 mm, and interfragmentary strain is less than 2%, contact healing can occur. In this case, cutting cones, which consists of osteoclasts, form across the fracture lines, generating cavities at a rate of 50–100 μm/day.
The cell is TRAP-positive (Tartrate-resistant acid phosphatase) and morphologically indistinguishable from the osteoclast. However, morphometric evaluation showed that chondroclasts do not form ruffled edges and clear zones, i.e., known resorption characteristics, to the same extent as osteoclasts, present at the lower metaphysis.
Founded in 1954, the AbilityLab is designed for patient care, education, and research in physical medicine and rehabilitation (PM&R). The AbilityLab specializes in rehabilitation for adults and children with the most severe, complex conditions ranging from traumatic brain and spinal cord injury to stroke, amputation and cancer-related ...
The Brain Trauma Foundation (BTF) was founded in 1986 to develop research on traumatic brain injury (TBI). Since its formation the foundation's mission has expanded to improving the outcome of TBI patients nationwide through working to implement evidence-based guidelines for prehospital and in-hospital care, quality-improvement programs, and coordinating educational programs for medical ...