Results: the number of the rootlets in every cervical dorsal root are almost the same.

结果：颈部各节段后根所含各级神经束的数目基本一致。

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Results:(1)Each dorsal roots has 4~6 rootlets and formed 2~4 subbundles, and formed 2 superior-inferior arranged bundle;

结果：（1）一条脊神经后根有4~6根神经小束组成，然后形成2~4根神经亚束，最后形成上、下2股神经束。

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