ossification

ossification
= osteogenesis; n.
the formation of bone, which takes place in three stages by the action of special cells (osteoblasts). A meshwork of collagen fibres is deposited in connective tissue, followed by the production of a cementing polysaccharide. Finally the cement is impregnated with minute crystals of calcium salts. The osteoblasts become enclosed within the matrix as osteocytes (bone cells). In intracartilaginous (or endochondral) ossification the bone replaces cartilage. This process starts to occur soon after the end of the second month of embryonic life. Intramembranous ossification is the formation of a membrane bone (e.g. a bone of the skull). This starts in the early embryo and is not complete at birth (see fontanelle).

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  • ossification — [ ɔsifikasjɔ̃ ] n. f. • 1697; de ossifier 1 ♦ Formation du tissu osseux par transformation d un tissu fibreux ou cartilagineux en substance osseuse. ⇒ ostéogenèse. Point, centre d ossification. Ossification des fontanelles. 2 ♦ Production… …   Encyclopédie Universelle

  • Ossification — Os si*fi*ca tion, n. [Cf. F. ossification. See {Ossify}.] 1. (Physiol.) The formation of bone; the process, in the growth of an animal, by which inorganic material (mainly lime salts) is deposited in cartilage or membrane, forming bony tissue;… …   The Collaborative International Dictionary of English

  • Ossification — (v. lat.), 1) Knochenbildung (s.d.); 2) Verknöcherung. Ossificationspunkte (Puncta ossificationis), die in einem nicht bleibenden Knorpel zuerst sich knöchern zeigenden Stellen, von denen die weitere Knochenbildung anhebt …   Pierer's Universal-Lexikon

  • Ossification — Ossification, lat. deutsch, Knochenbildung, Verknöcherung …   Herders Conversations-Lexikon

  • ossification — 1690s, from L. ossis (gen. of os) of bones (see OSSEOUS (Cf. osseous)) …   Etymology dictionary

  • Ossification — Bone is broken down by osteoclasts, and rebuilt by osteoblasts, both of which communicate through cytokine (TGF β, IGF) signalling. Ossification (or osteogenesis) is the process of laying down new bone material by cells called osteoblasts. It is… …   Wikipedia

  • Ossification — Ostéogenèse L ostéogenèse est le processus par lequel s élabore le tissu osseux. L os est formé à partir : d une matrice organique (35%) composée essentiellement de collagène de type I (90%), mais aussi d autres protéines comme l… …   Wikipédia en Français

  • ossification — (o ssi fi ka sion) s. f. 1°   Terme d anatomie. Génération des os, développement normal du système osseux. •   À deux mois, le foetus a plus de deux pouces de longueur ; l ossification est sensible au milieu du bras, de l avant bras, de la cuisse …   Dictionnaire de la Langue Française d'Émile Littré

  • Ossification — The process of creating bone, that is of transforming cartilage (or fibrous tissue) into bone. The human skeleton initially consists largely of cartilage which is relatively soft and is gradually transformed into hard bone during infant and child …   Medical dictionary

  • OSSIFICATION — s. f. Formation des os, changement insensible des parties membraneuses et cartilagineuses en os. L ossification se fait peu à peu. L ossification du coeur, de l aorte. Le point d ossification …   Dictionnaire de l'Academie Francaise, 7eme edition (1835)

  • OSSIFICATION — n. f. Formation des os. Cet anatomiste a étudié l’ossification dans le foetus. Il se dit aussi du Changement insensible des parties membraneuses et cartilagineuses en tissu osseux. L’ossification du coeur, de l’aorte. Le point d’ossification …   Dictionnaire de l'Academie Francaise, 8eme edition (1935)

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