Aula Medula Espinhal
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Medula Espinhal- macroscopia-
FISIOTERAPIA UNIPAC – TO2103
Bethania Pimenta
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- Sistema Nervoso Central(medula espinhal, tronco encefálico,
cerebelo, encéfalo)
- Sistema Nervoso Periférico(nervos e terminações nervosas)
Organização do SN
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- Sistema Nervoso Central- Sistema Nervoso Periférico
Organização do SN
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- Substância Branca(vias de transmissão) Fibras nervosas
- Substância Cinzenta(corpo celular)Sinapse
Organização do SN
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- Medula = miolo/o que está dentro
medula espinhal = “miolo” do canal vertebral
- Começamos o estudo do SN pela medula porque é o órgão mais simples e onde o tubo neural foi menos modificado durante o desenvolvimento.
Medula Espinhal
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Medula = Homem adulto 45 cm/ mulher um pouco
menor
- limites: cranialmente bulbo (aproximadamente forame magno do occipital)
caudal: a nível da L2. cone medular filamento terminal
Medula Espinhal
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cilíndrica, ligeiramente achatada no sentido antero-posterior
Medula Espinhal
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- calibre: intumescências cervical e lombar
( > quantidade de neurônios)
Medula Espinhal
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Substância cinzentaSubstância branca
Medula Espinhal
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- Sulco mediano posterior - Fissura mediana anterior- Sulco lateral posterior- Sulco lateral anterior- Sulco intermédio posterior- Cornos anterior, lateral, posterior - Funículo anterior, lateral, posterior (colunas)- Fascículo grácil e cuneiforme- Canal central medular- Comissura anterior.
Macroscopia da Medula
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Nervos espinhais:
Origem nos sulcosFilamentos radiculares raiz nervosaRaiz ventral Raiz dorsal Segmentação medular – 31 pares de
nervos
Nervo espinhal
Macroscopia da Medula
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Nervos espinhais- axônios motores e sensoriais de um
único segmento espinhal
Macroscopia da Medula
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nervo espinhal (saindo pelo
forame intervertebral)
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Topografia vertebro medular:
- Até o 4º mês IU, o crescimento medular acompanha o crescimento vertebral
(alongamento das raízes nervosas)- Cauda equina – L1/L2
Macroscopia da Medula
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Entre C2 e T10 adiciona-se 2 ao processo espinhoso
T11 e T12: lombares
L1: sacrais
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Envoltórios medulares:Meninges
- Dura-máter – fibras colágenas (dura e espessa) saco dural – fundo de saco
- Aracnóide (folheto justaposto a dura-máter)
- Pia-máter- filamento terminal – filamento da dura-máter – ligamento coccígeo
Ligamento denticulado
Macroscopia da Medula
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Envoltórios medulares
Espaço extradural – tecido adiposo + plexo venoso vertebral interno
Espaço subdural – virtual (peq qtde de liquido)
Espaço subaracnódeo - liquor
Macroscopia da Medula
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Macroscopia da
Medula
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Envoltórios medulares:Espaço subaracnóideo:- Retirada de líquor;- medida de pressão do líquor;- introdução de substâncias que
aumentam o contraste em exames;- introdução de anestésicos.(anestesias raquidianas – epidurais)
Macroscopia da medulaMacroscopia da medula
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