ultrastructura tesuturilor epitelial si conjunctiv
TRANSCRIPT
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Ultrastructura ţesuturilor epitelial şi conjunctiv
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Ultrastructura ţesutului epitelial
Polaritatea celulelor epiteliale:
• Domeniu apical
• Domeniu latero-bazal
Polaritatea este dată de:
• Joncţiuni intercelulare
• Distribuţia organitelor şi citoscheletului
• Lamina bazală
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Ultrastructura ţesutului epitelial
Polul apical
Microvili
Zonula occludens
Zonula adherens
Joncţiune gap
Pliuri membranare
C. Junqueira – “Basic Histology”, 10th edition
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Ultrastructura ţesutului epitelial
Specializări ale domeniului apical:
• Specializări de suprafaţă:– Cili– Microvili– Stereocili
• Specializări ale citoscheletului şi organitelor– Reţeaua terminală– Granule de secreţie
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Microvili – Microscopie electronică de transmisie (MET)
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Microvili, glicocalix, joncţiuni - MET
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Microvili – MET, secţiune transversală
Plasmalema
Schelet actină
Glicocalix
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Microvili – Microscopie electronică de baleiaj (MEB)
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Cili – MET, sceţiune longitudinală şi transversală
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Cili - MET
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Cili şi microvili - MET
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Cili şi microvili - MEB
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Joncţiuni - MET
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Joncţiuni - MET
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Desmozomi, stratul spinos - MET
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Zonula occludens – MET şi criofractură
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Joncţiuni gap – MET şi criofractură
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Ultrastructura ţesutului epitelial
Specializări ale domeniului bazo-lateral:
• Falduri membranare
• Joncţiuni de ancorare
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Falduri ale memb. Bazale – MET
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Falduri ale memb. Bazale – MET
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Ultrastructura ţesutului epitelial
Tipuri de epitelii:
• Simplu pavimentos
• Simplu cubic
• Simplu cilindric
• Pseudostratificat cilindric ciliat
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Epit. simplu pavimentos – MEB
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Epit. simplu cubic şi pavimentos – MEB
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Epit. simplu cubic cu microvili - MET
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Epit. simplu cilindric - MEB
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Epit. simplu cilindric - MEB
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Epit. respirator - MET
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Ultrastructura ţesutului epitelial
Epitelii glandulare:
• Celule caliciforme
• Acin seros
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Celule caliciforme – MET
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Acin seros - MET
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Ultrastructura ţesutului conjunctiv
Celule:
• Fibroblaste/fibrocite
• Mastocit
• Macrofag
• Plasmocit
Fibre:
• Fascicule de fibre de colagen
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Ţes. conj. lax - MET
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Fibrocite şi fibre de colagen - MET
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Mastocit – MET
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Macrofag – MET
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Plasmocit - MET
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Fascicule de fibre de colagen – MET şi MEB
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Fascicule de fibre de colagen - MEB
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Adipocite cu lamina bazală - MEB