目的：总结和分析用内漂白方法治疗无髓变色前牙的失败原因。
Objective: To sum up and analysis the causes of failure about treating pulpless and discolored anterior teeth with the method of interior tooth bleaching.
目的：描述无骨折脱位的急性中央型颈髓损伤的临床特点。
Objective: To describe clinical feature of acute central cervical cord injury without fracture and dislocation.
结果神经垂体主要由无髓神经纤维、垂体细胞及富含毛细血管的结缔组织组成。
Results The neurohypophysis was composed of unmyelinated nerve fibres, pituicytes and connective tissue abound in blood capillaries.
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