lucrari practice -- histologie (marius raica)
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PDF, 81MB --- Lucrari Practice Histologie 1.TRANSCRIPT
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Coloranţi şi coloraţiiClasificare:• număr de coloranţi: doi coloranţi (acid/ bazic) – bicrome; trei coloranţi (de obicei unul bazic/doi acizi) - tricrome• tipul coloraţiei: colorare propriu-zisă (hematoxilină-eozină), reacţie chimică (histochimică), reacţie imunologică (imunohistochimică)
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Tipuri de coloraţii• morfologice• histochimice• histoenzimologice• imunohistochimice• citologice
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Tipuri de reacţii• bazofilia: caracterizează substraturile care se
colorează cu reactivi bazici (e.g. hematoxilina); exemple de structuri bazofile: nucleii (cromatina) şi corpii Nissl (reticul endoplasmic rugos)
• acidofilia: caracterizează substraturile care se colorează cu reactivi acizi (e.g. eozina, verdele lumină); structuri acidofile: citoplasma, fibrele de colagen
• metacromazia: caracterizează substraturi care modifică culoarea colorantului; exemplu: albastru de toluidină colorează mucusul în violet
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Coloraţii morfologice• hematoxilină–eozină: nucleul colorat în violet-
albastru, citoplasma în roz• tricromă Masson: nucleul violet intens,
citoplasma nuanţe de gri sau albastru palid, fibrele musculare în roşu, fibrele colagene în albastru
• tricromă Gömöri: nucleul violet, citoplasma colorată diferit, dependent de momentul funcţional al celulei, fibrele musculare în roşu, fibrele colagene în verde
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Coloraţii histochimice• reacţia PAS: identifică gupări aldehidice libere
(glicogen, glicoproteine)• albastru de toluidină: mucine nesulfatate şi
sialomucine, metacromatic; nucleii, ortocromatic• albastru alcian: glicozaminoglicani sulfataţi
(heparină, condroitin sulfat)• mucicarmin: mucus• impregnări argentice: fibre de reticulină,
neurofibrile• orceină: fibre elastice
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Reacţii histoenzimologice• evidenţiază prezenţa enzimelor prin
reacţie de culoare• cele mai utile în practică:
– fosfataza alcalină– fosfataza acidă– adenozintrifosfataza– acetilcolinesteraza
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Reacţii imunohistochimice• se bazează pe afinitatea dintre antigen şi
anticorp; produsul final de reacţie se vizualizează cu diaminobenzidină (DAB) şi este colorat în brun
• citokeratina: exprimată de celulele epiteliale• actina: exprimată de celulele musculare şi
mioepiteliale• cromogranina A: exprimată de celulele sistemului
neuroendocrin difuz• colagenul IV: membranele bazale• antigenul specific prostatic: exprimat de celulele
glandulare prostatice
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Coloraţii citologice• coloraţiile citologice se efectuează pe frotiuri• Papanicolaou: nucleii coloraţi în albastru-violet,
citoplasmele în nuanţe de orange - verde - roşu• albastru policrom tanin-Drăgan: nucleii sunt
coloraţi în albastru-violet, citoplasmele în albastru (ortocromatic) sau violet (metacromatic)
• May Grünwald Giemsa: nucleii coloraţi în nuanţe de violet intens, citoplasmele în violet deschis, identifică granulaţiile din citoplasma elementelor figurate sanguine şi a precursorilor medulari
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ŢESUTURILEESUTURILEEPITELIALEEPITELIALE
DefiniDefiniţţieieŢŢesuturile epiteliale sunt formate esuturile epiteliale sunt formate din din celule celule
dispuse ordonatdispuse ordonat, , strstrââns ns apoziţionate, , solidarizate prin joncsolidarizate prin joncţţiuniiuni
Celulele individuale Celulele individuale preprezzintintăă îîn n citoplasmcitoplasmăăfilamente filamente de de citokeratincitokeratinăă ((markerul markerul
imunohistochimic imunohistochimic al al epiteliilorepiteliilor))
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Caractere generale• acoperă suprafeţele şi delimitează
cavităţile, formează glandele• celulele sunt solidarizate prin
joncţiuni şi prezintă microdomenii distincte de membrană
• prin microdomeniul bazal celulele sunt solidarizate la membrana bazală
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Clasificare generală• de acoperire: acoperă suprafeţe şi
delimitează cavităţi şi organe cavitare
• glandulare: glandele exocrine şi endocrine
• senzoriale: celule specializate în recepţia stimulilor
• mioepitelii: specilizate în contracţie
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Epiteliile de acoperire• Criterii de clasificare: numărul de straturi
celulare şi forma celulelor din stratul superficial
• Număr de straturi celulare: simple (un singur rând), stratificate (mai multe rânduri)
• Variantă: pseudostratificate• Forma celulelor din stratul superficial:
scuamoase, cubice, columnare
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Epitelii pseudostratificate• un singur rând de celule, nuclei la
diferite înălţimi• epiteliu respirator • uroteliu• căi genitale masculine
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Epitelii stratificate• zone: bazală , intermediară, superficială• stratificate scuamoase: cu şi fără
keratinizare• stratificate scuamoase keratinizate:
epiderm• stratificate scuamoase nekeratinizate:
cavitate bucală, faringe, esofag, col uterin, vagin
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Membrana bazală• structură acelulară , omogenă • acidofilă• PAS +, argirofilă• imunohistochimic: colagen IV,
laminină
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Epiteliile glandulare
DefiniţieŢesuturile epiteliale glandulare sunt
formate din celule înalt specializate în sinteza unor produşi specifici
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Epiteliile exocrine• unicelulare: celula caliciformă• multicelulare: epiteliul gastric de
acoperire, secretor de mucine şi glandele tubulare
• glande tubulare: simple, ramificate şi tubulo-acinare
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Acinii• seros: cel mai mic, rotund, format numai din
celule seroase, lumen îngust; parotidă, pancreas• mucos: ovalar, format numai din celule
mucoase, lumen larg şi neregulat, celule mioepiteliale în jur; sublinguală, esofag
• mixt: ovalar, cel mai mare, celulele mucoase dispuse central delimitează lumen larg, celulele seroase dispuse la periferie sub formă de semilună, celule mioepiteliale în jur; submandibulară
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Miofibroblastul• caractere intermediare între fibroblast şi
celula musculară netedă• nucleu cu contur sinuos• citoplasmă acidofilă, conţine filamente
contractile de actină• produce colagen şi se contractă• identificare: anti-actină, anti-vimentină• localizare: vilozităţi intestinale, plăgi în
curs de vindecare
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Mastocitul• nu se evidenţiază la coloraţia HE• identificare: albastru de toluidină, albastru
alcian-safranină• morfologie: celulă cu formă rotundă,
ovalară sau poligonală, care conţine în citoplasmă granulaţii alcianofile, metacromatice
• localizare: în toate ţesuturile conjunctive, concentrate perivascular şi perinervos
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Pericitul• localizare: în jurul vaselor sanguine
mici (capilare şi venule postcapilare)• formă stelată, prelungiri
citoplasmatice ramificate care înconjură vasul sanguin
• nucleu ovalar, eucromatic• citoplasma palid acidofilă la HE,
colorată intens cu anti-actină
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Macrofagul• derivă din monocitul circulant• formă poligonală sau neregulată• nucleu rotund, hipercrom, fără nucleol• citoplasmă acidofilă omogen sau conţine
particule endocitate (resturi celulare, pigmenţi, particule inerte)
• totalitatea macrofagelor din organism: sistemul mononuclear-macrofagic
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Fibrele de colagen• ATENŢIE! fibrele sunt un produs de
secreţie al celulelor. Nu au nuclei• acidofile, grosimi diferite, organizate în
fascicule, neramificate• se colorează în roz cu eozină, în verde sau
albastru cu metodele tricrome• localizare: în toate ţesuturile conjunctive
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Fibrele de reticulină• nu se evidenţiază cu metoda HE, ci
numai prin impregnare argentică• subţiri, relativ egale ca grosime,
ramificate şi anastomozate, formând reţele
• localizare: plămân, rinichi, glande exocrine şi endocrine, ficat (schimburi rapide de substanţe)
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Ţesutul mezenchimal• celule: mezenchimale• substanţă fundamentală bogată• fibre: absente• localizare: embrion, făt; la adult,
insule mici în jurul capilarelor• formează: toate ţesuturile
conjunctive, musculare şi unele epitelii
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Ţesutul reticular• celule: reticulare• fibre: de reticulină• substanţă fundamentală: bogată• localizare: stroma organelor
hematolimfopoetice (excepţie timusul)
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Ţesutul conjunctiv lax• celularitate: polimorfă (fixe şi mobile)• fibre: subţiri de colagen, dispuse
dezordonat, rare elastice• substanţă fundamentală: bogată• localizare: dermul superficial, lamina
propria a organelor tubulare (întotdeauna în vecinătatea epiteliilor)
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Ţesuturile conjunctive dense dezordonate şi ordonate
• celule reduse numeric (fibrocite, fibroblaste)
• numeroase fibre de colagen, în fascicule; dispuse dezordonat sau ordonat
• puţină substanţă fundamentală
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Ţesutul conjunctiv dens dezordonat
• fibre groase de colagen organizate în fascicule dispuse dezordonat
• rare fibrocite şi fibroblaste• puţină substanţă fundamentală• localizare: dermul profund,
submucoasa organelor tubulare
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Ţesutul conjunctiv ordonat• celule relativ numeroase• fibre de colagen groase, dispuse
paralel, în fascicule• substanţă fundamentală redusă• tendon, ligament, aponevroză, ţesut
lamelar
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Tendonul• celulele: tenocite• secţiune longitudinală: fibre colagene
paralele, nuclei bigeminaţi sau cvadrigeminaţi ai tenocitelor
• secţiune transversală: arii acidofile, nucleii tenocitelor sunt între fibre; tenocitele au formă stelată (prelungiri citoplasmatice printre fibre)
• învelişuri: endo-. peri- şi epitenonium
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Ţesutul conjunctiv lamelar
• fibre de colagen groase, dispuse concentric
• rare celule de tip fibroblastic –fibrocitar
• substanţă fundamentală redusă• localizare: cornee, capsula
corpusculilor senzitivi, perinerv
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Matricea cartilaginoasă• între celulele cartilaginoase• omogenă, moderat acidofilă (colagen)• teritorială şi interteritorială• metacromatică• PAS pozitivă (glicoproteine)• alcianofilă (glicozaminoglicani)• forme particulare: la elastic şi fibros
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Ţesutul osos şi osul ca organ
Ţesut conjunctiv dur, format din celule şi matrice extracelulară mineralizată
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Celulele ţesutului osos• osteoprogenitoare: celule dormante care se pot
transforma în osteoblaste; localizare: în imediata vecinătate a ţesutului osos
• osteoblaste: situate la periferia ţesutului osos; sintetizează matricea extracelulară
• osteocite: celule mature localizate în lacunele ţesutului osos, interconectate prin prelungiri citoplasmatice fine, incluse în canaliculi osoşi
• osteoclaste: celule multinucleate, macrofage ale tesutului osos; celula cu origine medulară, rol în resorbţie şi remodelare
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Tipuri de tesut osos• unitatea structurală de bază: lamela
osoasă, formată din osteocite dispuse în acelaşi plan şi matricea mineralizată dintre ele
• în funcţie de aranjamentul lamelelor se disting:– ţesut osos compact– tesut osos spongios
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Tesutul osos compact• format din lamele osoase dispuse sub
formă de:– sisteme haversiene (osteoane) centrate de
canal Havers– sisteme interstiţiale (solidarizează osteoanele
vecine)– sisteme circumferenţiale extern şi intern
• prezent în diafiza oaselor mari şi late corticala oaselor scurte şi late
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Ţesutul osos spongios• lamelele osoase nu sunt organizate de
obicei sub formă de osteoane• prezent în epifiza oaselor mari şi zona
centrală a oaselor scurte şi late • format din trabeculi osoşi de forme şi
mărimi diferite; nu prezintă canale Havers
• prezintă spaţii ovalare (lacune) în care se găsesc celule osoase (osteocite)
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Osul ca organ• periostul: ţesut conjuctiv dens situat la periferia
osului, format din două zone: internă cu celule osteoprogenitoare, şi externă formată din ţesut conjuctiv dens
• ţesutul osos• endostul: ţesut conjunctiv care delimitează
cavităţile osului,asemănător zonei interne a periostului; conţine celule osteoprogenitoare
• măduvă hematogenă• extremităţile articulare ale oaselor lungi:
acoperite de cartilaj hialin
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Osificarea• intramembranoasă: se desfăşoară pe
model de ţesut conjunctiv cu transformarea celulelor mezenchimale în osteoblaste, prin intermediul ţesutului condroid; prezentă la oasele cutiei craniene şi viscerocraniului
• endocondrală: pe model de ţesut cartilaginos (hialin); prezentă la majoritatea oaselor organismului
• mixtă: mandibulă, omoplat
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Etapele osificării endocondrale• modelul de cartilaj hialin• osul periostal• degenerarea cartilajului• mugurii conjunctivo-vasculari• diferenţierea osteoblastelor cu secreţia de
matrice• centrii de osificare• resorbţie şi remodelare - osteoclaste
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Creşterea oaselor în lungime• cartilajul de creştere de la limita epifiză –
diafiză• zonele cartilajului de creştere:
– cartilajul de rezervă– zona hiperplazică– zona hipertrofică– zona cartilajului degenerat– frontul de proliferare conjunctivo-vasculară– zona osului imatur, cu osteoclaste– zona de ţesut osos matur
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Ţesuturile musculare striate• prezintă striaţii longitudinale şi
transversale (miofibrile)• scheletal• visceral• cardiac• celularitate specifică: celule musculare
striate scheletale şi viscerale (fibre musculare) şi celule musculare striate cardiace
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Fibra musculară striată• secţiune longitudinală: coloană acidofilă,
cu striaţii transversale şi nuclei multipli, palid coloraţi, situaţi sub plasmalemă (sarcolemă); striaţiile transversale –prezenţa sarcomerelor
• secţiune transversală: arie poligonală sau rotundă, cu aspect punctat acidofil, 1-2 nuclei la periferie
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Învelişurile muşchiului striat scheletal
• endomisium: ţesut conjunctiv lax subţire, cu fibre de reticulină, înveleşte fiecare fibră, rare vase capilare
• perimisium: ţesutul conjunctiv care solidarizează mai multe fibre, formând fascicule, numeroase vase capilare
• epimisium: înveleşte muşchiul în totalitate, conţine vase sanguine de dimensiuni mai mari
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Ţesutul muscular striat visceral
• structural asemănător celui scheletal• fibre mai groase şi mai scurte• localizare: limbă, faringe, treimea
superioară a esofagului, sfincter uretral extern, sfincter anal
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Placa motorie• formă particulară de sinapsă• componenta presinaptică: terminaţia
axonală ramificată a neuronului motor
• componenta postsinaptică: porţiune delimitată a fibrei musculare, fără striaţii, cu numeroase organite şi concentrare de nuclei
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Ţesutul muscular cardiac• celule musculare striate cardiace: nucleu unic
(rar dublu) situat central, ramificaţii prin care se solidarizează la celulele vecine (discurile intercalate)
• între fasciculele de celule musculare cardiace: ţesut conjunctiv cu numeroase capilare
• ţesutul nodal: celule grupate, dispuse în spaţiul subendocardic, poligonale, nucleu central, citoplasmă palid colorată, pot avea striaţii în zona periferică, filamentele contractile nu sunt organizate în sarcomere
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Ţesutul muscular neted
• celule musculare netede: fuziforme, nucleu unic, central, citoplasmă acidofilă, cu striaţii longitudinale; organizate în fascicule; între celulele individuale – cantitate minimă de ţesut conjunctiv cu fibre de reticulină
• localizare: tubul digestiv, arbore bronşic. organe cavitare (stomac, veziculă biliară, vezică urinară, uter)
• marker: desmină şi actină de tip muşchi neted
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Ţesutul nervos
Celulele ţesutului nervos:• neuroni • celule de susţinere (glii în sistemul nervos central şi celule Schwann şi satelite în periferie)
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Neuronul• corp celular şi prelungiri• corpul celular format din nucleu şi
citoplasmă cu organite, filamente de citoschelet şi incluziuni
• prelungirile neuronale: – dendritele: unice sau multiple, mai groase la
bază, intens ramificate – axonul: unic, con de emergenţă, segment
iniţial, segment de conducere, ramificaţie terminală
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Tipuri de neuroni• multipolari: un axon, mai multe
dendrite (neuroni motori, interneuroni)
• bipolari: un axon şi o dendrită (olfactivi, retină)
• unipolari: o singură prelungire (neuronii din ganglionii nervoşi spinali şi ataşaţi nervilor cranieni)
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Celulele de susţinereSistemul nervos central (celule gliale –
marker: proteina glială fibrilară acidă):• astrocitele (protoplasmatice, fibroase,
periventriculare şi Bergmann)• oligodendrocitele (formează mielina)• microgliaSistemul nervos periferic:• celula Schwann (formează mielina)• celulele satelite
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Organele sistemului nervos central
• Creier• Cerebel• Măduva spinării• Bariera hemato-encefalică• Plexurile coroide• Învelişurile sistemului nervos central
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Componentele straturilor cortexului cerebelos
• molecular: fibrele aferente (agăţătoare şi muşchioase). dendritele neuronilor Purkinje, axonii neuronilor granulari, rari interneuroni mici, celule gliale şi vase sanguine
• mijlociu: corpul celulelor Purkinje, interneuroni (celule Lugaro) şi celule gliale (Bergmann)
• granular: corpul şi dendritele neuronilor granulari, segmentul iniţial al axonilor neuronilor Purkinje
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Bariera hemato-encefalică• cea mai selectivă din organism• componente:
– celulele endoteliale, cu puţine vacuole de transport şi margini suprapuse
– membrana bazală a endoteliului– prelungirile dilatate terminal ale
astrocitelor
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Plexurile coroide şi celula ependimară
• Plexurile coroide: la nivelul ventriculilor, formate din celule epiteliale şi piamater: filtrează plasma – lichidul cerebro-spinal
• Celula ependimară: formează epiteliul care delimitează cavităţile SNC; în canalul spinal prezintă microvili la polul apical (resorbţia l.c.s.)
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Învelişurile sistemului nervos central
• duramater: ţesut conjunctiv fibros• arahnoida; ţesut conjunctiv lax
acoperit de epiteliu de tip scuamos• piamater: ţesut conjunctiv lax
subţire, în contact cu substanţa nervoasă
• suport pentru vase sanguine
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Sistemul nervos periferic
• Ganglionii nervoşi spinali şi asociaţi nervilor cranieni• Fibrele nervoase• Nervul periferic• Învelişurile nervului periferic• Sistemul nervos autonom• Receptorii senzitivi
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Ganglionii nervoşi spinali şi asociaţi nervilor cranieni
• organe încapsulate• capsula: ţesut conjunctiv dens• neuroni unipolari care au corpul celular
globulos în zona periferică a ganglionului, înconjurat de celule satelite
• prelungirile neuronilor unipolari: concentrate în zona centrală, părăsesc ganglionul prin hil
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Fibrele nervoase• fibra nervoasă: axonul, înconjurat de teaca de
mielină, metode de identificare morfologice şi acid osmic (vizualizează mielina)
• în imediata vecinătate a fibrei nervoase: stratul celulelor Schwann şi ţesut conjunctiv fin
• între celulele Schwann consecutive: strangulaţiile Ranvier (conducerea saltatorie)
• mai multe fibre nervoase formează nervul periferic
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Nervul periferic• fascicule de fibre nervoase care transmit acelaşi
tip de impuls nervos, grupate prin ţesut conjunctiv
• secţiune longitudinală: aspect fibrilar, palid colorat cu metoda HE datorită dizolvării mielinei; între tecile de mielină ale fibrelor nervoase vecine – celule Schwann
• secţiune transversală: fibra nervoasă cu axonul punctiform, central, înconjurat de un halou necolorat (teaca de mielină; în jur se dispune circular celula Schwann
• învelişurile nervului periferic
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Învelişurile nervului periferic• endonerv: ţesutul conjunctiv foarte fin
care înveleşte fiecare fibră nervoasă; componentele sale sunt sintetizate de celulele Schwann şi nu este vascularizat
• perinerv: ţesut conjunctiv lax, grupează mai multe fibre nervoase, vascularizat, cu fibroblaste şi mastocite
• epinerv: înveleşte nervul periferic în totalitate, format din ţesut conjunctiv lamelar
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Sistemul nervos autonom• ganglioni asociaţi sistemului nervos
autonom: nu au capsulă proprie, neuroni multipolari, puţine celule satelite; localizare: în straturile submucos şi muscular ale organelor tubulare şi cavitare ale organismului
• fibre nervoase• simpatic• parasimpatic• enteric
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Corpusculii senzoriali• structuri specializate în preluarea
informaţiilor din mediul extern şi intern, pe care le transformă în influx nervos
• terminaţii nervoase libere• corpusculi senzoriali: fibră nervoasă
dispusă central, adesea contorsionată, înconjurată de ţesur conjunctiv lamelar
• exemple: corpusculii Vater-Paccini, corpusculii Meissner
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Eritrocitele• anucleate, rotunde, 7 microni
diametru• disc biconcav: centru palid, periferie
intens colorată• coloraţia May Grunwald Giemsa:
nuanţe de portocaliu
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Trombocitele• anucleate, fragmente din citoplasma
megacariocitului• cele mai mici elemente figurate
sanguine• poligonale• centru intens colorat: granulomer• periferie: palid colorată, hialomer
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Granulocitul neutrofil• rotund, diamtru 10-12 microni• nucleu lobulat (2-5 lobi), punţi fine
de cromatină, cromozom sexual• citoplasmă acidofilă• granulaţii specifice mici,
punctifome, care se colorează cu reactivi neutri (granulaţii neutrofile)
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Granulocitul eozinofil• rotund, 10-12 microni diametru• nucleu lobulat (de obicei doi lobi)• citoplasmă acidofilă• în citoplasmă, granulaţii acidofile
specifice, rotunde, egale, colorate în portocaliu
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Granulocitul bazofil• rotund, 9-10 microni diametru• nucleu nelobulat, de formă
neregulată, intens colorat• citoplasmă acidofilă• granulaţii inegale, cu formă variată,
care pot masca nucleul şi se colorează cu reactivi bazici
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Limfocitul• rotund, diametru variabil (mic, mijlociu,
mare)• nucleu rotund, ovalar, rar reniform,
heterocromatic, intens colorat• citoplasmă intens bazofilă, redusă
cantitativ• limfocitele mijlocii şi mari pot conţine
câteva granulaţii nespecifice, azurofile
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Monocitul• cel mai mare element figurat sanguin• rotund sau ovalar, 12-20 microni
diametru• nucleu reniform sau poligonal, cu
nucleol, aspect striat al cromatinei• citoplasmă palid bazofilă (cenuşiu-
albăstruie), câteva granulaţii azurofile în concavitatea nucleului
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Formula leucocitarăRaportarea procentuală a leucocitelor• granulocite neutrofile segmentate: 50-65%• granulocite neutrofile nesegmentate: 1-3%• granulocite eozinofile: 2-4%• granulocite bazofile: 0 – 0.5%• limfocite: 25-35%• monocite: 3-8%
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Hematopoeza• Definiţie: procesul de formare al elementelor figurate sanguine• La adult, toate elementele figurate sanguine se formează numai în măduva hematogenă• Metodologie de studiu: frotiul efectuat prin puncţie medulară• Raportarea procentuală a precursorilor elementelor figurate sanguine; medulogramă
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Celula stem• 0.2% din populaţia celulară a
măduvei hematogene• dimensiuni mici (8-10 microni),
adesea fuziformă• nucleu rotund sau ovalar,
eucromatic, cu nucleoli multipli• citoplasmă bazofilă, omogenă fără
granulaţii sau incluziuni
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Hematopoeza la adult
• eritropoeză• granulocitopoeză• trombocitopoeză• limfocitopoeză• plasmocitopoeză• monocitopoeză
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Limfocitopoeza şi plasmocitopoeza
• Limfocitopoeza: toate celulele au nucleu rotund şi citoplasmă bazofilă fără granulaţii specificeFiliaţie: limfoblast – prolimfocit – limfocit
• Plasmocitopoeza: nucleu heterocromatic, excentric, citoplasmă bazofilă; are loc în măduva hematogenă, organe limfoide şi ţesutul conjunctivFiliaţie: limfocit B activat de limfocit T helper –(proplasmocit) - plasmocit
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Măduva hematogenă• localizare: cavităţile oaselor• forme: roşie, galbenă, cenuşie, fibroasă• capsulă: endost, dublat extern de ţesut
osos• trabeculi osoşi acoperiţi de endost• organ nelobulat• stromă: ţesut reticular• parenchim: ţesut mieloid
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Tipuri de ţesut limfoid
Folicul limfoidCordon limfoid
Infiltrat limfoid difuz
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Cordonul limfoid• aglomerare de limfocite dispuse în şiraguri
• conţine predominant limfocite T• localizare: zona medulară a
ganglionului limfatic şi tecile periarteriolare ale splinei
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Infiltratul limfoid difuz• aglomerare masivă de limfocite, fără
aranjament particular• conţine limfocite B şi T în proporţii
aproximativ egale• localizare: ţesutul limfoid asociat
mucoaselor, joncţiunea cortico-medulară a ganglionului limfatic, amigdală
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Organele limfopoetice
•Timus•Ganglion limfatic•Splină•Amigdale•Ţesut limfoid asociat mucoaselor
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