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Świąd i złuszczanie skóry
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Wyszukaj w serwisie


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Świąd i złuszczanie skóry


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Publikacja stanowi fragment książki Jak myśleć klinicznie w praktyce

WWP_9_16_SWIAD_I_ZLUSZCZANIE_SKORY_BOOK

Świąd to nieprzyjemne odczucie, wywołujące chęć drapania lub pocierania skóry. Z fizjologicznego punktu widzenia ma ono wywołać reakcje, których następstwem będzie eliminacja pasożytów. Jest to objaw uwarunkowany autonomicznie, niezależny od występowania bólu. Świąd powoduje drapanie, które z kolei wywołuje odczucie bólu, tłumiące swędzenie. Należy pamiętać, że u zwierząt mamy jedynie możliwość zaobserwowania skłonności do drapania, którą interpretuje się jako behawioralną reakcję na świąd. Receptory świądu są swoistymi, wolnymi zakończeniami nerwowymi znajdującymi się w naskórku, w miejscu przejścia skóry właściwej w naskórek oraz w skórze właściwej. Po zadziałaniu na zakończenia nerwowe odpowiednich mediatorów bodźce świądowe są przenoszone włóknami aferentnymi, wolno przewodzącymi włóknami C do grzbietowego rogu rdzenia kręgowego, a poprzez ośrodkowe szlaki nerwowe – do podwzgórza.

Czynniki ośrodkowe

Próg odczuwania świądu ulega obniżeniu w następujących przypadkach:

  • w nocy,
  • przy podwyższonej temperaturze skóry,
  • przy zmniejszonym nawodnieniu skóry,
  • w stanach pobudzenia psychicznego.

W sytuacjach stresowych odczuwanie świądu może być nasilone z uwagi na uwalnianie peptydów opioidowych. Rywalizacja pomiędzy różnymi bodźcami (bólu, dotyku, [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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