Histologia ţesuturilor şi a organelor
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Transcript of Histologia ţesuturilor şi a organelor
![Page 1: Histologia ţesuturilor şi a organelor](https://reader033.fdocuments.net/reader033/viewer/2022061418/568134a6550346895d9baf8f/html5/thumbnails/1.jpg)
Histologia ţesuturilor şi a organelor
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Epitelii
Celule lipite, nu lasă loc pentru vase, nervi etc.
Epiteliile de acoperire sunt separate de ţesutul conjunctiv (corion, stromă) prin membrana bazală
Tipuri de epiteliu
Simplu (unistratificat)
Stratificat
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Epitelii simple
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Pavimentos (mezoteliu)
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Epiteliu cubic
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Epiteliu cilindric
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Epiteliu cilindric pseudostratificat
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Epitelii stratificate
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Epiteliu scuamos (pavimentos)
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Epiteliu tranziţional (uroteliu)
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Ţesuturi cu celule dispuse în fascicule
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Ţesut fibros şi ţesut muscular neted
Celule (fibre): fuziforme
Nuclei: unici, ovalari, poziţie centrală
Citoplasma:
- puţină, palidă (slab eozinofilă): → ţesut fibros
- abundentă, intens eozinofilă → ţesut muscular
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conjonctif
Muşchi scheletic
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conjonctif
Miocard
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Ţesuturi cu celule duspuse în cavităţi situate în substanţă fundamentală
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Ţesut osos şi cartilaginos
Condrocite → condroplaste
Osteocite → osteoplaste
Cartilaj: substanţă fundamentală bazofilă
Os: substanţă fundamentală eozinofilă
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Ţesut adipos
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Ţesut nervos
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Celule rare, dispuse pe un fond fibrilar palid eozinofil
Neuroni: mari, formă triunghiulară (piramidală)
Celule gliale: mici, nuclei rotunzi, citoplasmă slab vizibilă
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Structuri cu lumen
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!!! Stratul celular cel mai intern:
Vase: → celule endoteliale– Alungite, aplatizate, dispuse de-a lungul membranei bazale – Distanţate – Nuclei alungiţi, aplatizaţi, dispuşi de-a lungul membranei
bazale
Tubi epiteliali: glande, canale glandulare, ducte biliaire, tubi
uriniferi, tubi seminiferi, bronşii → celule epiteliale– Cubice, cilindrice– Lipite între ele – Nuclei rotunzi sau ovalari, dispuşi perpendicular pe
memebrana bazală
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Vase
Capilar: membrană bazală + endoteliu
Arteră: perete mai gros, lumen rotund (+/- limitantă elastică)
Venă: perete mai gros decât al capilarului, lumen colabat, deformat
Structură generală: intimă
medie
adventice
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Tubi epiteliali
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Glande
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Canal biliar
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Bronşie
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Diagnosticul microscopic al organelor
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Creier: ţesut nervos bariera hematoencefalică (spaţiul Virchow-Robin)
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Plămân: pachet bronhovascular (bronşie + arteră pulmonară ± alveole, praf de cărbune (pigment antracotic)
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Ficat: spaţiu port - canal biliar, arteră (hepatică), venă (portă) ± cordoane de hepatocite
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Inimă: miocard
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Tub digestiv: 4 straturi
- mucoasă- submucoasă- musculoasă- seroasă
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RinichiGlomeruli
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Organe limfoide: - Ganglioni lmfatici
- Splină
Limfocite grupate în foliculi limfoizi
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Splina: arteră în centrul foliculului limfoid
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Ganglion limfatic: fără vas centrofolicular
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Pancreas: insule Langerhans + acini
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Exerciţii
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