Mondholte & zacht gehemelte & huig
parakeratotische verhoorning = meerlagig plaveisel eptiheel
kernhoudende oppervlakkig gelegen cellen met keratinestapeling
Mondholte & hard gedeelte
Orthokeratotische verhoorning = bovenste laag volledig verhoord zonder kernen
Verhoornde kernvrije oppervlakkig gelegen cellen met stratum granulosum
Microplicae
Tong
, Spierweefsel verloopt in verschillende richtingen, is omgeven door
epitheel
Bovenaan: verhevenheden = tongpapillen
Onderaan: verbinding tong = lissa = verbindingslaag dat tong aan
onderkant van mondholte vasthecht
4 verhevenheden/tongpapillen:
Mechanische papillen:
Papillae filiformes: draadvormige papillen
Kleine weerhaakjes naar achter gericht -> ruwheid + voedsel op tong naar achter
brengen
Papillae marginales (tijdelijk)
Zuigreflex bij pasgeborenen
Smaakpapillen:
Papillae fungiformes: paddenstoelvormige papillen
Enkel smaakknoppen op bovenoppervlak
Papillae foliatae: bladvormige papillen
Rudimentair voor de mens
Papillae circumvallatae: omwalde papillen
Grootste
Gelegen op grens voorste 2/3e en achterste 1/3e in V-vormige
formatie
Omgeven door groeve met in wand smaakknoppen en in bodem sereuze klieren van
Von Ebner -> secreet spoelt groeve zodat knoppen nieuwe smaakprikkels kunnen
ontvangen
Caliculus gustatorius = smaakknop
Cluster van cellen, komen samen op apicaal oppervlak in smaakputje met opening in naar
lumen (mondholte) = smaakporus
Verschillende celtypes:
Type I: steuncellen
Type II: neuro-epitheelcellen -> receptorfunctie
Type III: peervormige cellen met basaal veel e-dense vesikels -> smaakperceptie
Type IV: precursor cellen = basale vervangcel, onderaan gelegen
Type V : marginale cellen, perifeer gelegen
Sensorische vezels geven signaal door van de 5 smaken
Tanden
Opbouw:
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