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Juliana Geller - 103 Plexo Cervical - Faz a inervação das estruturas do pescoço É formado pelos 4 primeiros pares de nervos cervicais. Os ramos ventrais desses nervos cervicais formam alças e dessas alcas partem ramos que partem ou para a parte superficial (para pele) ou profundos (para a musculatura) Alça cervical: o nervo hipoglosso - quando sai da base do crânio - recebe uma comunicação do plexo cervical (principalmente de C1 ). Essas fibras que saem de C1 acompanham o nervo hipoglosso e depois se destacam dele, formando a raiz superior da alça cervical (fibras de C1 e principalmente de C2). Algumas fibras do plexo (C2 e C3) formam a raiz inferior da alça cervical, essas duas raízes se juntam, formando a alça cervical. A partir dessa alça saem os ramos que inervam os músculos infra- hioideos. A alça fica superficialmente à bainha carotídea. Exceções: dois músculos (tireo-hióideo e gênio-hióideo) são inervados diretamente por fibras que continuaram do nervo hipoglosso - apesar delas pertencerem ao plexo cervical, por isso não se pode dizer que esses músculos são inervados pelo hipoglosso. C4 e C5 formam o nervo frênico, que se coloca sobre o músculo escaleno anterior, responsável pela inervação do diafragma. Todos os ramos cutâneos do plexo cervical se superficializam, perfurando a lâmina superficial da fáscia cervical. Todos os ramos superficiais do plexo cervical pr ime i ro tem um t ra je to pos ter io r , depo i s superficialmente, contornando a borda posterior do ECM. Esses ramos cutâneos partem das alças do plexo. O ponto médio da borda posterior do ECM é conhecido como ponto nervoso do pescoço, que é um local onde emergem esses ramos cutâneos. - Nervo Occipital Menor: vem do plexo cervical (C2) - Nervo Occipital Maior: ramo dorsal de C2 - Nervo Auricular Magno: orelha, parótida e ângulo da mandíbula. 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