NationMaster - Encyclopedia: Ossification

Ossification is the process of bone formation, in which connective tissues, such as cartilage are turned to bone or bone-like tissue. The ossified tissue is invaginated with blood vessels. These blood vessels bring minerals like calcium and deposit it in the ossifying tissue. It is thought that this process led to bone as a structural element in vertebrates. Minerals were deposited in cartilage, which was used for storage. Bone was thus an exaptation from the ossified cartilage. This article is about the skeletal organs. ... Cartilage is a type of dense connective tissue. ... Minerals are natural compounds formed through geological processes. ... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Standard atomic weight 40. ... This article is about the skeletal organs. ... Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Minerals are natural compounds formed through geological processes. ... Cartilage is a type of dense connective tissue. ... An exaptation is a biological adaptation where the biological function currently performed by the adaptation was not the function performed while the adaptation evolved under earlier pressures of natural selection. ... Cartilage is a type of dense connective tissue. ...

Category: Skeletal system Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... Section of fetal bone of cat. ... Osteoblasts and osteoclasts on trabecula of lower jaw of calf embryo. ... Mesenchyme (also known as embryonic connective tissue) is the mass of tissue that develops mainly from the mesoderm (the middle layer of the trilaminar germ disc) of an embryo. ... It has been suggested that temporal fenestra be merged into this article or section. ... Wikipedia does not have an article with this exact name. ... This article is about the skeletal organs. ... Cartilage is a type of dense connective tissue. ... Cartilage is a type of dense connective tissue. ... 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. ... The perichondrium is a layer of dense connective tissue which surrounds the cartilage. ... 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. ... 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. ... This article is about the skeletal organs. ... 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. ... An osteoblast (from the Greek words for bone and germ or embryonic) is a mononucleate cell that is responsible for bone formation. ... 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. ... 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 is one of two main types of bone. ... For other uses of the word bone, see bone (disambiguation). ... The diaphysis is the main or mid section (shaft) of a long bone. ... 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. ... This article does not cite any references or sources. ... The long bones are those that are longer than they are wide, and grow primarily by elongation of the diaphysis, with an epiphysis at the ends of the growing bone. ... Where a part of the skeleton is intended for strength and compactness combined with limited movement, it is constructed of a number of short bones, as in the carpus and tarsus. ... Flat Bones. ... The irregular bones are such as, from their peculiar form, cannot be grouped as long bone, short bone, or flat bone. ... In anatomy, a sesamoid bone is a bone embedded within a tendon. ...