| Osteoblast | | | | Osteoblasts and osteoclasts on trabecula of lower jaw of calf embryo. | | | | Part of the growing edge of the developing parietal bone of a fetal cat. | | Gray's | subject #18 87 | | MeSH | Osteoblasts | | Dorlands/Elsevier | o_08/12600120 | An osteoblast (from the Greek words for "bone" and "germ" or embryonic) is a mononucleate cell that is responsible for bone formation. Osteoblasts produce osteoid, which is composed mainly of Type I collagen. Osteoblasts are also responsible for mineralization of the osteoid matrix. Bone is a dynamic tissue that is constantly being reshaped by osteoblasts, which build bone, and osteoclasts, which resorb bone. Image File history File links Gray81. ...
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Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ...
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This article is about the skeletal organs. ...
Drawing of the structure of cork as it appeared under the microscope to Robert Hooke from Micrographia which is the origin of the word cell being used to describe the smallest unit of a living organism Cells in culture, stained for keratin (red) and DNA (green) The cell is the...
Osteoid is a protein mixture which is secreted by osteoblasts. ...
Tropocollagen triple helix. ...
Illustration depicting extracellular matrix (basement membrane and interstitial matrix) in relation to epithelium, endothelium and connective tissue In biology, the extracellular matrix (ECM) is the extracellular part of animal tissue that usually provides structural support to the cells in addition to performing various other important functions. ...
Osteogenesis
Osteoblasts arise from osteoprogenitor cells located in the periosteum and the bone marrow. Osteoprogenitors are immature progenitor cells that express the master regulatory transcription factor Cbfa1/Runx2. The periosteum is an envelope of fibrous connective tissue that is wrapped around the bone in all places except at joints (which are protected by cartilage). ...
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The term progenitor cell is used in cell biology and developmental biology to refer to immature or undifferentiated cells, typically found in post-natal animals. ...
In molecular biology, a transcription factor is a protein that binds DNA at a specific promoter or enhancer region or site, where it regulates transcription. ...
Cbfa1/Runx2 is key transcription factor associated with osteoblast differentiation. ...
Osteoprogenitors are induced to differentiate under the influence of growth factors, in particular the bone morphogenetic proteins (BMPs). Aside from BMPs, other growth factors including fibroblast growth factor (FGF), platelet-derived growth factor (PDGF), transforming growth factor beta (TGF-β) may promote the division of osteoprogenitors and potentially increase osteogenesis. Growth factor is a protein that acts as a signaling molecule between cells (like cytokines and hormones) that attaches to specific receptors on the surface of a target cell and promotes differentiation and maturation of these cells. ...
Bone morphogenetic proteins (BMPs) are growth factors belonging to the TGF-β (Transforming Growth Factor-beta) super family with a strong ability to induce new bone and/or cartilage formation. ...
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Transforming growth factor (TGF) is one of many characterized growth factors that exist in nature. ...
Once osteoprogenitors start to differentiate into osteoblasts, they begin to express a range of genetic markers including Osterix, Col1, ALP, osteocalcin, osteopontin, and osteonectin. Although the term osteoblast implies an immature cell type, osteoblasts are in fact the mature bone cells entirely responsible for generating bone tissue in animals and humans. Tropocollagen triple helix. ...
Ball and stick model of alkaline phosphatase Alkaline phosphatase (ALP) (EC 3. ...
Osteocalcin is a protein found in bone and dentin; that plays a role in mineralization and calcium ion homeostasis ...
Osteopontin is a glycoprotein first identified in 1986 in osteoblasts. ...
Osteonectin is a glycoprotein in the bone that binds calcium. ...
Morphology and histological staining The cytoplasm of osteoblasts appears to be basophilic via normal H&E stain due to presence of large amount of rough endoplasmic reticulum. A large Golgi apparatus is also present in the centre. The nucleus is spherical and large. Osteoblasts can be stained for type 1 collagen or for the production of alkaline phosphatase. The endoplasmic reticulum or ER is an organelle found in all eukaryotic cells that is an interconnected network of tubules, vesicles and cisternae that is responsible for several specialized functions: Protein translation, folding, and transport of proteins to be used in the cell membrane (e. ...
Ball and stick model of alkaline phosphatase Alkaline phosphatase (ALP) (EC 3. ...
Osteoblasts and osteocytes -
Osteoblasts in developing bone Osteoblasts that become trapped in the bone matrix become osteocytes. They cease to generate osteoid and mineralized matrix, and instead act in a paracrine manner on active osteoblasts. They are believed to act in a mechanosensory manner. An osteocyte, a star-shaped cell, is the most abundant cell found in bone. ...
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An osteocyte, a star-shaped cell, is the most abundant cell found in bone. ...
External links | Musculoskeletal system, connective tissue: bone and cartilage | | Cartilage | perichondrium, fibrocartilage callus, metaphysis cells (chondroblast, chondrocyte) A garden sign welcomes residents and visitors to Rogers Park as home of Loyola University Chicago. ...
The musculoskeletal system (also known as the locomotor system) is an organ system that gives animals the ability to physically move using the muscles and skeletal system. ...
Connective tissue is one of the four types of tissue in traditional classifications (the others being epithelial, muscle, and nervous tissue. ...
This article is about the skeletal organs. ...
Cartilage is a type of dense connective tissue. ...
Cartilage is a type of dense connective tissue. ...
The perichondrium is a layer of dense connective tissue which surrounds the cartilage. ...
A fibrocartilage callus is a temporary fibrocartilage callus which forms as bone attemps to heal a fracture. ...
The metaphysis is the body of cartilage that separates the epiphyses and the diaphysis of long bones during growth. ...
A chondroblast is a cell, which originates from a mesenchymal stem cell and forms Chondrocytes, commonly known as cartilage cells. ...
Chondrocytes (< Greek chondros cartilage + kytos cell) are the only cells found in cartilage. ...
types (hyaline, elastic, fibrous) | | Bone | ossification (intramembranous, endochondral, epiphyseal plate) cycle (osteoblast, osteoid, osteocyte, osteoclast) Cartilage is type of dense connective tissue. ...
Elastic cartilage is a type of cartilage present in the outer ear, larynx, and epiglottis which contains fibers made of elastin. ...
Cartilage is type of dense connective tissue. ...
This article is about the skeletal organs. ...
Ossification is the process of bone formation, in which connective tissues, such as cartilage are turned to bone or bone-like tissue. ...
Osteoblasts and osteoclasts on trabecula of lower jaw of calf embryo. ...
Section of fetal bone of cat. ...
The long bones are those that are longer than they are wide, and grow primarily by elongation of the diaphysis at an epiphysis at one end of the growing bone. ...
Osteoid is a protein mixture which is secreted by osteoblasts. ...
An osteocyte, a star-shaped cell, is the most abundant cell found in bone. ...
An osteoclast (from the Greek words for bone and broken) is a type of bone cell that removes bone tissue by removing the bones mineralized matrix. ...
types (cancellous, cortical) Cancellous bone (or trabecular bone, or spongy bone) is a spongy type of bone with a very high surface area, found at the ends of long bones. ...
Cortical bone, also known as compact bone is one of two main types of osseous tissues. ...
regions (epiphysis, metaphysis, diaphysis) For other uses of the word bone, see bone (disambiguation). ...
The metaphysis is the body of cartilage that separates the epiphyses and the diaphysis of long bones during growth. ...
The diaphysis is the main or mid section (shaft) of a long bone. ...
structure (osteon/Haversian system, Haversian canals, endosteum, periosteum, Sharpey's fibres, enthesis, lacunae, canaliculi, trabeculae, medullary cavity, bone marrow) Osteons (cross section) Osteons (also called Haversian system in honor of Clopton Havers) are predominant structures found in some lamellar or compact bone. ...
Haversian canals are a series of tubes around narrow channels formed by lamellae. ...
Endosteum is the inner lining of the bone. ...
The periosteum is an envelope of fibrous connective tissue that is wrapped around the bone in all places except at joints (which are protected by cartilage). ...
Sharpeys fibres (bone fibres, or perforating fibres) are a matrix of connective tissue consisting of bundles of strong collagenous fibres connecting periosteum to bone. ...
Enthesis (plural: entheses) is the point at which a tendon inserts into bone, where the collagen fibres are mineralised and integrated into bone tissue. ...
In histology, a lacuna is a small space containing an osteocyte in bone or chondrocyte in cartilage. ...
Canaliculi are small, microscopic canals between the various lacunae of ossified bone. ...
Definition and etymology trabeculae. ...
The medullary cavity is the central cavity of bone shafts where yellow marrow (adipose tissue) is stored. ...
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