动眼神经冠状断层解剖与MRI

Sectional Anatomy and MRI of Oculomotor Nerve on the Coronal Plane

目的：探讨冠状断面上动眼神经的解剖特征与MRI表现，为相关病变的影像诊断和外科手术提供解剖学依据。方法：取用成人尸头标本15例，经冰冻后，用电动断层带锯制成连续断层标本；用3．0TMR扫描仪，获取10例成人志愿者的3D—CISS序列图像；在上述断层标本与MRI图像上观察动眼神经在冠状断面上的走行规律及毗邻关系。结果：动眼神经在经中脑脚问窝的断面上，呈“八”字形，紧贴两侧大脑脚向外下方走行，居大脑后动脉和小脑上动脉之间；在经海绵窦后份的断面上，位于“工”字形结构下端的左右两侧；在经海绵窦前份的断面上，位于前床突下方，颈内动脉的外侧；在经眶尖部的断面上，位于视神经和下直肌的外下方。结论：在冠状断面上可清晰显示动眼神经脑池段、海绵窦段和眶尖段的位置及其毗邻关系。

Objective：To describe the coronal anatomical features and MR imaging of the oculomotor nerve in order to provide anatomic data for the imaging diagnosis and surgery of oculomotor nerve lesions. Methods ： 15 sets of adult heads were frozen and sectioned with an electric bandsaw into serial coronal sections ; 10 healthy volunteers were examined by a 3D - CISS sequence using a 3.0 - Tesla MR system; The sectional a- natomy of the oculomotor nerve and its adjacent structures were identified on the coronal sectional plane and MR imaging. Results：The oculomotor nerve through the interpeduneal fossa runs lateral and inferiorly, shaping like the Chinese word ＂八＂, and passes between the posterior cerebral arteries and superior cerebellar arteries; The oculomotor nerve across the posterior part of cavernous sinus located on both of the left and right side of dia- phragma sellae ; The oculomotor nerve across the anterior part of cavernous sinus located below the anterior cli- noid proeess and outside the internal carotid artery; The oculomotor nerve across the orbital apex located lateral inferior to the optic nerve and inferior rectus muscle. Conclusions：The coronal section can demonstrate accu- rately the distribution, location and the relations to surrounding tissues of oculomotor nerve.