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HISTOLOŠKA BOJENJA
MALI MOZAK
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Longitudinalno posmatran, mali mozak ima jedan mediosagitalni deo - crvuljak (vermis cerebelli) i dve simetrične polovine - hemisfere (haemispheria cerebelli)
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Transverzalno posmatran, cerebelum se sastoji od tri režnja:- Prednji ili anteriorni (lobus
cerebelli anterior)- zadnji ili posteriorni (lobuscerebelli posterior)- flokulo-nodularni (lobusflocculonoddularis)
Svaki od ovih režnjeva čineodgovarajući delovi vermisa ihemisfera.
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Sagitalni presek 4xMOLEKULARNI SLOJSLOJ PURKINJE ĆELIJAGRANULARNI SLOJ
SIVA
MAS
A
BELA MASA
HOROIDNI PLEKSUS
4 KOMORA
MOŽDANO STABLO
MEKA OVOJNICATVRDA OVOJNICA
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* DUBOKA JEDRA
* *
* *
Sagitalni preseci
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4 KOMORA
M. STABLO
Koronalni presek
M. MOZAK
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1. MOLEKULARNI SLOJ
2.SLOJ PURKINJE ĆELIJA
3.GRANULARNI SLOJ
BELA MASA
MEKA OVOJNICA
TVRDA OVOJNICA
SIVA MASA
Sagitalni presek 10x
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Tipovi neurona u kori
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MOLEKULARNI SLOJ
SLOJ PURKINJE ĆELIJA
GRANULARNI SLOJ
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MOLEKULARNI SLOJ
SLOJ PURKINJE ĆELIJA
GRANULARNI SLOJSIVA
MAS
A
MEKA OVOJNICA
Korpaste ćelije
Zvezdastećelije
40x
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* DUBOKA JEDRA * *
5X
40X
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BELA MASA 40x
Vide se tela glijskih ćelija.
Gra
nula
rni s
loj
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MS
PN
BM
GS
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BM
GSMS
PN
GS
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BM
GS
MS
PN
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Ćelije horoidnog pleksusa (CP) u 4. komori
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5x 10x 20x
40x
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CEREBELLUM (Mali mozak)Pripada metencefalonu zajedno sa ponsom, a zauzima krov
4. moždane komore. To je voluminozna struktura koja čini10% težine velikog mozga čoveka. Sastoji se iz dvehemisfere koje se karakterišu mnoštvom vijuga-folija iizduženog vermisa (crv). Siva masa cerebeluma se nalazispolja i označena je kao kora malog mozga, a uunutrašnjosti strukture je bela masa. Zahvaljujući velikojizbrazdanosti, površina malog mozga (kora) izuzetno je velika- za samo 25% manja je od površine kore prednjeg mozga. Uunutrašnjosti svake folije nalaze se mijelinizirana nervnavlakna na koja naležu slojevi nervnih ćelija kore malogmozga. U beloj masi nalaze se grupacije neuronskih tela-sivamasa, od koje se sastoje cerebelarna jedra: nucleus fastigii,nucleus globossus, nucleus emboliformis i nucleusdentatus.
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Mali mozak, kao i ostali delovi centralnog nervnog sistemaizgrađen je od sive i bele mase. Siva masa obuhvata:
- površinski sloj formirajući koru (cortex cerebelli)
- centralne delove malog mozga gde obrazujejedra (nuclei cerebelli).
Bela masa (corpus medullare cerebelli) gradi ostatak malogmozga, a formiraju je aferentni i eferentni putevi malogmozga, kao i aksoni Purkinje neurona.
Bela masa zalazi u veoma naboranu koru i ovakvaorganizacija bele mase malog mozga ima na sagitalnimpresecima izgled veoma razgranatog drveta (arbor vitae).
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Histološka gradja cerebelumaKoru čine tri sloja ćelija:Spoljašnji sloj 1. Molekularni sloj sadrži dve vrste nervnihćelija: zvezdaste (stelatne) i korpaste, kao i veliki brojrazgranatih dendrita Purkinje neurona iz drugog sloja,aferentne aksone (puzajuća vlakna), vertikalne aksonegranularnih ćelija iz trećeg sloja i njihove horizontalneogranke (paralelna vlakna), dendrite Golgi II neurona.Paralelna vlakna su aksoni granularnih ćelija i stvarajusinapsu sa Purkinje neuronima direktno ili prvo sa inhibitorniminterneuronima prvog sloja, tj. sa korpastim i zvezdastimćelijama.Sa Purkinje neuronima stvaraju vezu i aksoni čija suneuronska tela u donjem maslinastom jedru (oliva inferior)produžene moždine. Ovi aksoni su označeni kao puzajućavlakna.Srednji sloj 2. Purkinje ćelijeUnutrašnji sloj 3. Granularni sloj sadrži dva tipa nervnihćelija: granularne i Golgi II ćelije.
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Sva nervna vlakna koja se projektuju na cerebelum u vidu njegovih aferentnih projekcija, sem puzajućih nervnih vlakana, stvaraju sinapsu sa granularnim ćelijama i nazivaju se mahovinasta vlakna.