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Oczopląs u psów i kotów - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Oczopląs u psów i kotów


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Oczopląs patologiczny jest częstym objawem chorób neurologicznych u psów i kotów. Czasami jest pierwszym objawem toczącej się choroby – stanowi pierwszą jej manifestację. Rozpoznanie rodzaju zaburzeń gałkoruchowych może ułatwić postawienie diagnozy. Do prawidłowego przeprowadzenia badania neurologicznego niezbędna jest znajomość fizjologii ruchu gałek ocznych. Natomiast interpretacja stwierdzanych objawów patologicznych jest możliwa jedynie w przypadku znajomości lokalizacji i funkcji struktur uczestniczących w tym ruchu. Mięśnie zewnątrzgałkowe są unerwione przez nerwy czaszkowe okoruchowe, przedsionkowe i odwodzące. Pozycja i ruch gałki ocznej są dodatkowo kontrolowane przez układ przedsionkowy i sakkadowy, a ruchy te są modulowane przez móżdżek. Funkcją układu przedsionkowego w odniesieniu do widzenia jest utrzymanie obrazu wizualnego w stałej pozycji na siatkówce w odpowiedzi na ruchy głowy.

Rodzaje ruchów gałek ocznych

Podstawowym celem ruchu gałek ocznych jest uzyskanie ostrego, stabilnego i pojedynczego widzenia. Aby to osiągnąć, oczy muszą zostać skierowane na obiekt zainteresowania w taki sposób, by jego obraz padł na siatkówkę w miejscu gwarantującym najlepszy odbiór, czyli tam, gdzie zagęszczenie fotoreceptorów jest największe – w dołku środkowym. Obraz musi być tutaj wystarczająco stabilnie utrzymany, niezależnie od ruchu zwierzęcia czy obiektu. To zadanie jest realizowane przez dwie kategorie ruchów gałek ocznych – ruchy przemieszczające spojrzenie oraz utrzymujące spojrzenie. Spośród ruchów przemieszczających spojrzenie wyróżnia się sakkady, wolne ruchy śledzenia i ruchy wergencyjne. Do ruchów utrzymujących spojrzenie zalicza się fiksację, odruch przedsionkowo-oczny (VOR, ang. vestibulo-ocular reflex) i odruch optokinetyczny (OKR, ang. optokinetic reflex).

[...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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Poznaj nasze serwisy