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Histologie samenvatting chemische receptoren

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De samenvatting gaat over het hoorcollege van chemische receptoren en de uitgeschreven teksten ervan op de USB-stick die je kon kopen. Het gaat over het vak Histologie die in eerste bachelor biomedische wetenschappen gegeven wordt tijdens tweede semester.

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Uploaded on
April 12, 2021
File latest updated on
January 22, 2022
Number of pages
2
Written in
2020/2021
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Deel 3: Zintuigen: Chemoreceptoren (Smaak en Reuk)
1. Algemeen
• Buiten: exteroceptieve receptoren (vb. geur, smaak, licht, geluid)
• Binnen: proprioceptoren (bv. positie gewrichten, O2 en CO2 concentraties in bloed
• Snel adaptieve receptoren: toestandsveranderingen
• Traag adaptieve receptoren: blijvende toestand (bv. zwaartekracht)


2. Chemoreceptor: Smaak
Waarneming via smaakknoppen
• In epitheel
• Omvat verschillende ‘baanvormige’ sensorische cellen
• Maken contact met buitenwereld door smaakporus
• In contact met ZV
o Neurotransmitters vrijgesteld door cellen à binden op transmitter
receptoren op ZV
o ZV depolariseert
o Impuls doorgegeven
• Lichte kernen: smaakcellen
Donkere kernen: steuncellen
• papillae fungiformes
de papillae circumvallatae
papillae foliatae
• papil omgeven door soort ‘gracht’ à in groeve papil monden kliertjes van Von Ebner
uit à secreet spoelt smaakknoppen schoon à smaakcellen terug vrij


3. Chemoreceptor: Reuk
• Epitheel bedekt dak van de neusholte + stukje van neustussenschotten
• Rest neuslumen bekleed met respiratorisch epitheel
• Reukepitheel: pseudomeerlagig cilindrisch
• Reukcellen: zijn enige neuronen die in contact staan met buitenwereld + enige
neuronen die vernieuwd kunnen worden!!
• Bevat reukcellen (olfactorische neuronen), steuncellen, basale vervangcellen

Steuncellen: ondersteunen reukcellen
• Cilindrisch, smalle basis
• Verbonden met reukcellen via celjuncties
• Hebben microvilli aan apicale celopp.
• Ger bevat enzymen à verwijderen overtollige reukmoleculen à sensorische
signalen gestopt
Basale vervangcellen
• Kunnen delen + differentiëren zodat reukcellen + steuncellen vervangen kunnen
worden
• Klein rond/kegelvormig




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