analizatori - auditiv vestibular gustativ kinestezic
DESCRIPTION
curs anatomieTRANSCRIPT
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Curs 6: ANALIZATORII – AUDITIV, VESTIBULAR, GUSTATIV SI KINESTEZIC
Dr. Gabriela Turcu
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Segmentul periferic – localizat in urechea interna
Segmentul intermediar – conduce informatia catre centru (SNC)
Segmentul central – transforma informatia in auz
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pavilionul urechii – capteaza undele
Urechea externa sonore
conductul auditiv extern – le transmite timpanului
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Urechea medie
Urechea medie ↔ nazofaringe = trompa lui Eustachio
ciocan
Contine nicovala
scarita
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Urechea interna
trei canale semicirculare
doua vezicule : utricula si sacula
o formatiune rotita de doua ori si jumatate in jurul unui ax (columela), numita melc sau cohlee.
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Segmentul periferic (receptori) = celule ciliate, aflate in canalul cohlear (in melc) si stimulate de miscarile endolimfei
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Segmentul intermediar = nervul VIII, ramul acustic
• I-ul neuron → ggl. Corti (in columela)
• al II-lea neuron → trunchiul cerebral
• al III-lea neuron → metatalamus (corpi geniculati mediali)
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Traseul
nervului
auditiv
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Segmentul central = aria auditiva → lob temporal
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Ofera informatii legate de pozitia corpului in spatiu, schimbarile de pozitie, echilibru
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Segmentul periferic → celule ciliate din ampulele canalelor semicirculare, utricula si sacula (urechea interna), stimulate de miscarile endolimfei
Canalele semicirculare sunt dispuse pe cele 3 axe ale spatiului
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Segmentul intermediar = nervul VIII, ramul
vestibular
• I-ul neuron → ggl. Scarpa (urechea interna)
• Al II-lea neuron → in bulb
• Al III-lea neuron → in talamus
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Segmentul central = aria vestibulara → lobul temporal
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Segmentul periferic = celule ciliate → mugurii gustativi → papilele gustative → pe suprafata limbii
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Segmentul nervul VII (facial) → 2/3 anterioare limba
intermediar nervul IX (glosofaringian) → 1/3 posterioara limba
• I-ul neuron → ggl ai nervilor VII si IX
• al II-lea neuron → bulbul rahidian
• al III-lea neuron → talamus
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Segmentul central = aria gustativa → lobul parietal
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informatii asupra tonusului muscular si a pozitiei corpului in spatiu
Segmentul organele Golgi → in tendoanele muschilor
periferic fusuri neuromusculare → printre fibrele musculare scheletice (paralel cu ele)
Organe Golgi
Fusuri neuro-musculare
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Segmentul intermediar
I-ul neuron → ggl spinal de pe radacina posterioara a nervului spinal
bulb (pentru sensibilitatea proprioceptiva
al II-lea neuron constienta)
cornul posterior al maduvei (pentru sensibilitatea proprioceptiva inconstienta)
al III-lea neuron → talamus (pentru sensibilitatea constienta)
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Segmentul intermediar al
analizatorului kinestezic
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Segmentul central
Aria somestezica I → lobul parietal (sensibilitatea constienta) – pozitia fiecarui segment din corp
In paleocerebel (sensibilitatea inconstienta) – tonusul muscular si reglarea echilibrului in spatiu