CN9-sistema nervoso
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Transcript of CN9-sistema nervoso
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Sistema nervoso
Prof. Ana Rita Rainho
• Anatomia• Propagação do impulso nervoso• Sinapse
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Sistema Nervoso
Estímulo (sensorial)
Resposta (motora)
Integração da informação
Campbell, N. A.; Reece, J. B. (2002); Biology; 6th ed.; Benjamin Cummings; San Francisco; p.1023.
Receptor sensorial
EfectorEncéfalo e medula espinal
Sistema nervoso central (SNC)
Sistema nervoso periférico (SNP)
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Sistema Nervoso Central
Constituído por:
CérebroActos conscientes, percepção, fala, movimentos voluntários
Encéfalo
Cérebro
CerebeloBolbo raquidiano
CerebeloEquilíbrio, postura eCoordenação muscularBolbo raquidianoRegula algumas funções autónomas, como a respiração, a deglutição, o ritmo cardíaco ou a tosse
Web – encéfalo 3D
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Sistema Nervoso Central
Espinal Medula
Fazem parte do SN Periférico
Faz a ligação entre o
encéfalo e o SN Periférico
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Fazem parte do SN Periférico
Sistema Nervoso Central
Espinal medula Faz a ligação entre o encéfalo e o sistema nervoso periférico
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Estrutura do Neurónio
Terminal sináptico
Axónio Corpo celular
Núcleo
DendriteBainha de mielina
Nódulo de Ranvier
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Diversidade de formas
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Ao microscópio…
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As experiências de Luigi Galvani
No século XVIII surgem as primeiras intuições sobre os fenómenos eléctricos e magnéticos. Galvani descobre por acidente
que os músculos de uma rã se contraem se fechar o circuito entre os nervos e os músculos com um
fio de cobre.
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Transmissão do impulso nervoso
Libertação de neurotransmissoresFenda sináptica
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Estrutura de uma sinapse
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