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ossification

ossification The formation of bone tissue, which is ultimately derived from neural crest cells. The process is unique to vertebrates and differs from dentine formation in that it allows the continued existence of the mineralizing cells (osteoblasts) which reside in the lacunae of bone connected to each other by canalicula. Ossification is carried out by osteoblasts, which become arranged concentric to blood vessels (Haversian canals) to form cylindrical Haversian systems. The resulting bone, together with its series of Haversian systems, is encased in outer lamellae of bone plates and is then known as lamellar bone. Bone tissue may originate from the dermis of the integument giving rise to dermal bone, or occur by endochondrial ossification, which is the invasion and replacement of cartilagenous tissue with osteoblasts and subsequently bone.

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ossify

os·si·fy / ˈäsəˌfī/ • v. (-fies, -fied) [intr.] turn into bone or bony tissue: these tracheal cartilages may ossify. ∎  [often as adj.] (ossified) fig. cease developing; be stagnant or rigid: ossified political institutions. DERIVATIVES: os·si·fi·ca·tion / ˌäsəfiˈkāshən/ n.

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ossification

ossification (osteogenesis) (oss-i-fi-kay-shŏn) n. the formation of bone, which takes place in three stages by the action of 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.

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ossification

ossification The process of bone formation. It is brought about by the action of special cells called osteoblasts, which deposit layers of bone in connective tissue. In intramembranous ossification bones are formed directly in connective tissue (see membrane bone); in endochondral ossification the bones are formed by the replacement of cartilage (see cartilage bone).

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ossification

ossification (osteogenesis) Process of bone formation in vertebrates. Bone is formed through the action of special cells called osteoblasts, which secrete bone-forming minerals that combine with a network of tough protein collagen fibres.

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ossify

ossify XVIII. — F. ossifier, f. L. os, oss- bone; see OSSEOUS, -IFY.
So ossification XVII.

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ossify

ossifyDelphideify, reify •preachify, speechify •edify • ladyfy •acidify, humidify, rigidify, solidify •commodify, modify •codify • amplify • jellify • exemplify •vilify • simplify •mollify, qualify •nullify • uglify • ramify •humify, tumefy •mummify • magnify • damnify •dignify, signify •personify • unify • typify • stupefy •yuppify •clarify, scarify •terrify, verify •petrify • electrify • gentrify • rarefy •vitrify • horrify • transmogrify •glorify • putrefy • purify •classify, pacify •calcify • Nazify • specify • intensify •ossify • detoxify • falsify • crucify •dulcify, emulsify •diversify, versify •beatify, gratify, ratify, stratify •sanctify • satisfy •objectify, rectify •identify, misidentify •testify • prettify • mystify • quantify •fortify, mortify •notify • beautify • fructify • stultify •justify • certify • liquefy •hi-fi, sci-fi

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