Neuroanato 1.docx - Sis nervos prezinta o structura complexa ce presupune comunicari intre cel nervoase zone de preluare a info din mediu extern si

Neuroanato 1.docx - Sis nervos prezinta o structura...

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Sis nervos prezinta o structura complexa ce presupune comunicari intre cel nervoase, zone de preluare a info din mediu extern si intern precum si zone de proiectie a informatiilor primite si zone centrale de comanda cu centrii asezati pe diferite niveluri cu un grad inalt de conectivitate. In fct de dispozitia comonentelor SN se descriu: impartirea functionala si de tip topografic. Pot exista multe elemanatomice cu aceeasi pozitie sau au raporturi intime dar care functional sa difere f mult. De ex: exista nervi ce vin in rap cu glande, dar acesti nervi nu inerveaza acele glande. Cel gliale: nevroglii sunt celule interstitiale, de suport structural dar si metabolic si functional pt cel ceonsiderate drept unitati morfo funct: neuroni. Mai mult de 90% din Snc sunt electrice si nu prez intarziere sinaptica in timpul deplasarii, influxul circula cu o vit mai mare decat sinapsele chimice. Exista in SN anumiti neurottransmitatori ce pot avea trigger pt reflexe pshicie complexe mai ales cu participarea unor formatiuni ce au incarcatura functionala: sis limbic: memoria olfactiva, neurotrans faciliteaza memoria afectiva (sediul vietii afective). Microgliile cel stelate mici dense in jurul vaselor de sg in substanta cenusie. Au un rol important in a fagocita detritusurile neuronale, se invagineaza (neurovagie), exista 40 000 neuroni ce mor zilnic fara a se resintetiza altii. Exista afectiunila batrani cu cicatrici gliale.
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