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 臂叢主要由C5~T1脊神經(jīng)前支組成,部分T2和C4脊神經(jīng)也參與臂叢的構(gòu)成,C4脊神經(jīng)常發(fā)出分支加入C5脊神經(jīng),T2脊神經(jīng)發(fā)出的分支常加入T1脊神經(jīng)。C5、C6脊神經(jīng)在中斜角肌外側(cè)合并為上干;C7脊神經(jīng)移行為中干,C8脊神經(jīng)和T1脊神經(jīng)在前斜角肌 (共 249 字) [閱讀本文] >>