OSTEOGENEZA I OKOŠTAVANJE
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Transcript of OSTEOGENEZA I OKOŠTAVANJE
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OSTEOGENEZA I OKOŠTAVANJE
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Koštano tkivo
• specijalizovano vezivno tkivo
• građa-kolagen tip I i hidroksiapatit
• uloga: potporna, zaštitna, rezerva kalcijuma
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Podela
• primarna (fibrozna, nezrela)- alveola i sekundarna (lamelarna, zrela)
• kompaktna (kortikalna) i spongiozna (trabekularna)
• duge, kratke, pljosnate
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kompaktna i spongiozna kost
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Građa kompaktne kosti
• osteon- osnovna morfološka i funkcionalna jedinica
• osteoid- nemineralizovan koštani matriks
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Brušena kost
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Ćelije koštanog tkiva
• osteoprogenitori
• osteoblasti
• osteociti
• osteoklasti
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osteocit u lakuni
canaliculi
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Okoštavanje
• direktno (endezmalno, intramembranozno)
• indirektno (enhondralno)
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enhondralno-indirektno okoštavanje
Zona mirovanja
Zona umožavanja
Zona hipertrofije
Zona kalcifikacije
Zona osifikacije
Epifizna ploča
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