目的通过幕下小脑桥静脉的显微解剖、影像学观察及其对照研究,为幕下小脑上手术入路中桥静脉的保护提供形态学基础。方法分别对20例(40侧)上矢状窦和颈内静脉灌注蓝色乳胶的成人头颅湿标本、22例(40侧)DSA静脉相、20例(40侧)CTV和20例(40侧)MRV图像进行观测。结果以显微解剖结果作为对照标准,DSA、CTV和MRV分别观察到89%、40%和38%的桥静脉,测得的直径值分别大11%、17%和33%。桥静脉注入硬脑膜处的形态分为直接或经脑膜静脉(小脑幕窦)间接注入两种,脑膜静脉在影像学上表现为信号的不连续、缺失或者局部强度增加。桥静脉注入硬脑膜处主要分布在窦汇附近、小脑幕和岩上窦前部。结论术前影像学检查有助于幕下小脑上手术入路的设计和术中桥静脉的保护。 Objective To provide a morphological basis for the protection of the midbrain vein in the supratentorial cerebellar upper quadrant by means of microsurgical anatomy and imaging studies of the inferior cerebellar artery veins. Methods 20 adult (40 sides) DSA venous phases, 20 cases (40 sides) of CTV and 20 cases (40 sides) of adult head skull were perfused with blue latex on the superior sagittal sinus and jugular vein. MRV images were observed. RESULTS: Microanatomical results were used as a control. DSA, CTV, and MRV were observed in 89%, 40%, and 38% of the bridge veins, respectively, and measured diameter values ​​were 11%, 17%, and 33%, respectively. Intramural dural bridge at the injection into the shape of the direct or through the meningeal vein (tentorium) indirectly injected into the two, meningioma in the imaging showed discontinuity, loss of signal or increased local intensity. Infusion into the dural bridge at the venous sinus mainly in the vicinity of the sinus, the tentorium and petrous anterior sinus. Conclusions Preoperative imaging is helpful for the design of supratentorial cerebellum and intraoperative bridging vein protection.