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Ele acontece quando o disco intervertebral acaba se desgastando ou perdendo elasticidade e, assim, gerando fissuras e mudando o formato do disco. Um abaulamento discal pode evoluir para uma hérnia de disco no local. Nesse caso, o disco pode se deslocar em direção à medula espinhal ou raízes nervosas e, com isso, gerar dor irradiada, como a dor ciática. O disco intervertebral é uma estrutura que serve para amortecer os impactos na região. Ele se situa entre duas vértebras da coluna.
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A coluna vertebral tem função de sustentação de carga, locomoção, equilíbrio e proteção dos elementos neurais . É formada, basicamente, por vértebras, discos intervertebrais, músculos e ligamentos. No interior da coluna localizam-se nervos, incluindo medula espinal e raízes nervosas. A coluna vista de frente deve ser retilínea, porém existem curvaturas naturais quando a coluna vertebral é observada de lado. Essas curvaturas são chamadas cifose e lordose
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