The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.

下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。

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Results:The distal transverse palmar arches(DIPA) were 73%, 19% and 8% in nail root cross section, distal and proximal nail root respectively.

结果：指动脉的远侧掌横弓位于甲根平面、甲根平面以远和以近者分别占73％、19％和8％。

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Objective To investigate the diagnosis and treatment of the cervical nerve root coexisting with the distal nerve entrapment(Double crush syndrome).

目的 探讨近端颈神经根受压合并远端神经卡压 （双卡综合征 ）的诊断和治疗。

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