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目的：通过头颅三维断层标本与ＭＲＩ对照研究三叉神经桥池段，为影像学诊断提供解剖学依据。方法：利用头颅三维连续断层标本３５套、正常成人头颅ＭＲ检查１０３例和增强ＭＲ检查３６例，观察和测量三叉神经桥池段的形态、大小及周围血管关系。结果：三叉神经桥池段由后向前逐渐增粗，形态由圆形和椭圆形变为扁椭圆形；三叉神经根进入区（ＲＥＺ）的内上方有小脑上动脉行走，与ＲＥＺ相接触者在标本和ＭＲＩ上分别占１１．４％和１０．７％，ＲＥＺ下方有小脑下前动脉行走，与ＲＥＺ相接触者在标本和ＭＲＩ上各占７．１％和６．８％；３８％的ＲＥＺ和３５％的节前段（ＰＧＳ）两侧不等高，相差１～４ｍｍ；正常三叉神经桥池段无增强效应。结论：ＭＲＩ能清晰显示三叉神经桥池段，全程显示矢状位与轴位同样满意，冠状位对桥池段的间距、高度、形态和周围血管关系的显示最佳。
Objective: To study the anatomy of the trigeminal neuralgia by three-dimensional (3D) craniocerebral tomography and MRI. Methods: Thirty-five consecutive three-dimensional craniofacial skull specimens, 103 normal craniocerebral MR examinations and 36 enhanced MR examinations were performed. The morphology, size and peripheral blood vessels of the bridge were observed and measured. Results: The passage of the bridge of the trigeminal nerve gradually increased from posterior to anterior, and the morphology changed from round and oval to oblate; the upper trigeminal nerve root access zone (REZ) The specimens and MRIs accounted for 11.4% and 10.7% respectively. The anterior inferior cerebellar artery was run under the REZ and 7.1% and 6.8% respectively on the specimens and MRIs in contact with REZ. 38% REZ and 35% of the preganglionic segment (PGS) on both sides of the same height, a difference of 1 ~ 4mm; normal trigeminal nerve cell segment without enhancement. Conclusion: MRI can clearly show the segment of the trigeminal nerve plexus. The sagittal position is equally satisfactory with the axial position. The coronal position shows the best correlation with the distance, height, shape and surrounding blood vessels of the bridge segment.