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Sistemul vestibular

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by

Ioan-Andrei NICOLAE

on 21 January 2014

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Transcript of Sistemul vestibular

Urechea
Labirintul
membranos
Un canal semicircular
Ampula
Sub presiunea lichidului in miscare
cupula isi schimba pozitia
Utricula si sacula permit
perceptia acceleratiilor
orizontale si verticale
Otolitii, sub actiunea acceleratiilor antreneaza stratul gelatinos si terminatiile celulelor ciliate
Intra in componenta cupulei, saculei si utriculei
Celula ciliata
Functionarea celulelor ciliate
Celula are un kinocil si multi stereocili.
Varful fiecarui stereocil este legat de cel de alaturi cu o legatura subtire; atunci cand aceasta legatura este intinsa, celula este excitata, iar atunci cand este relaxata celula este ihnibata.
Asadar celula este excitata numai intr-un singur sens: dinspre stereocili spre kinocil.
Sistemul senzorial al urechii interne (vestibular)
Orientarea canalelor semicirculare
Orientarea cililor in
utricula si sacula
In final sistemul nervos are sarcina de a face transformarile din coordonatele senzorilor in coordonatele mediului in care actioneaza
si apoi in comenzi pentru muschi
Un exemplu:
Reflexul vestibulo-ocular
Full transcript