lp sem 2 1 vascular
TRANSCRIPT
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Sistemul vascular sangvin
LP Histologie nr. 1 / semestrul II / 2010-2011
dr. Mihnea Nicolescu
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CE ESTEsistemul vascular sangvin?
Un sistem închis de tuburi ( = vase sangvine) prin care circulă continuu sângele pompat de inimă.
Ventriculi → artere elastice → artere musculare → arteriole → capilare → venule postcapilare → vene mici, mijlocii, mari → Atrii
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formațiune cavitară/tubulară, cu un lumen rotund/oval
lumen delimitat de ENDOTELIU
1 rând de nuclei turtiți, heterocromatici
citoplasmă puțină, greu de evidențiat
peretele format din 3 TUNICI (straturi), diferite structural
inconstant, în lumen se pot observa elemente figurate
CUM recunoaștem un vas sangvin?Diagnosticul histologic
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Peretele vaselor sangvine
3 straturi concentrice
TUNICI
1. intima2. media3. adventicea
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Tunicile peretelui vascular
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1. INTIMA (tunica internă)
endoteliu
membrană bazală
± strat subendotelial (vizibil la vasele de calibru mare)
fibre conjunctive (de colagen și elastice)
fibre musculare netede
± limitantă elastică internă (lamelă elastică ondulată)
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LEI Col. ORCEINĂ
Col. H-E
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2. MEDIA (tunica medie)
• Fibre musculare netede• Fibre elastice și/sau lamele elastice• ± limitanta elastică externă
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3. ADVENTICEA(tunica externă)
• Fibre musculare netede• Fibre elastice și/sau lamele elastice• ± limitanta elastică externă
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PRINCIPALELE TIPURI DE VASE SANGUINE
Artere de tip elastic
Artere musculare
Arteriole
Metaarteriole
Venule postcapilare
Vene mici
Vene mijlocii
Vene mari
Capilare
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Artera de tip elasticdiagnostic de vas sangvin
perete gros, lumen rotund
Intima - strat subendotelial gros
Media - bine reprezentată
- nr. variabil de lamele elastice ondulate
- nuclei de fb.musc. netede printre lamele
Adventice - bine reprezentată
- are vasa vasorum
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AortăCol. ORCEINĂ
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Artera de tip muscular
diagnostic de vas sangvin
perete gros, lumen rotund, crenelat
are limitantă elastică internă (ondulată, groasă)
Media - are limitantă elastică externă
- nr. variabil (>5) de straturi concentrice de fb.musc. netede, ± lamele elastice ondulate
Adventice - are vasa vasorum
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Arteră muscularăCol. H-E
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LEI
LEE
Arteră muscularăCol. ORCEINĂ
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Arteră musculară Arteră elastică
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Arteriola
diagnostic de vas sangvin
are limitantă elastică internă (dispare sub Φ= 50μm)
Media - NU are limitantă elastică externă
- nr. variabil (1-3) de straturi concentrice de fb.musc. netede
Adventice - NU are vasa vasorum
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Arteriola
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Capilare
diagnostic de vas sangvin
perete f. subțire, format doar din intimă (endoteliu)
lumen rotund, ± elemente figurate sangvine
la exterior (inconstant) se pot observa nuclei alungiți (pericite)
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Capilare (longitudinal, HE)
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Venule postcapilare (HE)
Φ > Φ capilare
endoteliu
pericite (nuclei alungiți)
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VENE (mici, medii, mari)
diagnostic de vas sangvin
perete subțire, lumen oval, mare
Media - grupuri de fb.musc. netede, separate de ț.conj.
Adventice -foarte groasă
- vasa vasorum evidente (la v. mari/mijlocii)
limitele dintre tunici nu se disting
± valve
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Venă medie
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Venă cu valve
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Comparație artere - vene
Lumen
- rotund A - oval/turtit mare V
Perete
- gros A - subţire V
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Arteră musculară / venă
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Venulă, arteriolă, capilar (HE)
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Arteriolă, venulă, duct (HE)
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Diagnosti diferențial vase sangvine (microscopie optică)
INTIMA MEDIA ADVENTICEAE+MB LEI f.m.n./LEI LEE ț.conj. v.v.
Arteră elastică DA NU +/++++ NU +++ DA
Arteră musculară DA DA +++/± DA ++ DA
Arteriolă DA ± DA/NU NU + DA
CapilareVenule subcapilare
DA NU ± pericite
Vene DA ± +/incomplete NU ++++ DA
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