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Samenvatting Stelselmatige Weefselleer H12: Oor
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Samenvatting gebaseerd op slides van professor Vral met bijhorende notities van in de les, alles wat je voor de theorie moet kennen van dit onderdeel.
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Samenvatting H12: Hetgehoororgaan
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1. Inleiding..............................................................................................................................................2
2. Buitenoor............................................................................................................................................2
2.1 Oorschelp= auricula= pinna..........................................................................................................2
2.1.1 Functie...................................................................................................................................2
2.1.2 Bouw......................................................................................................................................2
2.2 Buitenste gehoorgang...................................................................................................................2
2.3 Trommelvlies of membrana tympani............................................................................................3
2.3.1 Epitheel naar buiten..............................................................................................................3
2.3.2 Fibro-elastische bindweefsellaag...........................................................................................3
2.3.3 Kraakbenige ring....................................................................................................................3
2.3.4 Epitheel naar middenoor.......................................................................................................3
3. Middenoor..........................................................................................................................................3
3.1 Cavum tympani.............................................................................................................................3
3.1.1 Epitheel..................................................................................................................................3
3.1.2 Fenestra vestibuli of foramen ovale.......................................................................................4
3.1.3 Fenestra cochleae of foramen rotundum...............................................................................4
3.2 Gehoorbeentjes............................................................................................................................4
3.3 Cellulae mastoidea........................................................................................................................4
3.4 Buis van Eustachius.......................................................................................................................4
4. Binnenoor...........................................................................................................................................5
4.1 Benig labyrint................................................................................................................................5
4.1.1 Vestibulum.............................................................................................................................5
4.1.2 Semicirculaire kanalen...........................................................................................................5
4.1.3 Cochlea..................................................................................................................................6
4.2 Vliezig labyrint..............................................................................................................................6
4.2.1 Vestibulair labyrint.................................................................................................................6
4.2.2 Cochleair labyrint of ductus cochlearis..................................................................................8
1
, 1. Inleiding
- Buitenoor
o Oorschelp
o Uitwendige gehoorgang
o Trommelvlies
- Middenoor: gehoorbeentjes
- Binnenoor: receptoren voor evenwicht en gehoor
- Alles omgeven door botweefsel van rotsbeen/os petrosum
2. Buitenoor
2.1 Oorschelp= auricula= pinna
2.1.1 Functie
- Opvangen geluidstrillingen
- Richtinghoren
2.1.2 Bouw
- Is anders bij iedereen
- Dunne huidplooi
- Centrale as= elastisch kraakbeen vorm geven
- Meerlagig verhoornd plaveiselepitheel
- Fijne haartjes en talgklieren
- Rond ingang: tragi
o = dikkere haren
o Tegenhouden van stofdeeltjes om trommelvlies te beschermen
- Hypodermis
o Aanwezig achteraan
o Afwezig vooraan
- Beperkte spieren aanwezig
2.2 Buitenste gehoorgang
- Voor iedereen verschillend
- Tot tegen trommelvlies: 3.5 cm lang
- Lichte knik veranderde richting
- Meerlagig verhoornd plaveiselepitheel
- Dermis
o Talgklieren
o Gewijzigde apocriene zweetklieren= cerumenklieren: productie cerumen/oorsmeer
Beschermt tegen vocht + beschadiging + infecties
Soepel houden van weefsel
Beschermen tegen verweking van weefsel
Bestaat uit onverzadigde vetzuren die oxideren bij contact met lucht lange
blootstelling geeft donkerdere kleur van oorsmeer
- Buitenste 3/5: C-vormig elastische kraakbeen buis
- Binnenste 2/5: bot
- Functie
o Resonator
o Versterkt geluidstrillingen
2
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