目的　观察锁骨重要毗邻结构的解剖特征及其体表投影，为体外钢板固定治疗锁骨骨折的安全性提供基础。  方法　成人尸体标本15具30侧，分别观察锁骨下动静脉及臂丛和锁骨以及喙突的毗邻关系，并测量相应数据，确定锁骨下动静脉及臂丛在锁骨表面的投影范围。  结果　锁骨下动静脉及臂丛在锁骨表面的投影范围大约在其由内向外的第二个1/4段。锁骨下动静脉及臂丛和锁骨下缘的最近距离左侧平均为0.42 cm，右侧平均为0.57 cm。  结论　体外钢板固定治疗锁骨骨折时在锁骨由内向外的第二个1/4段穿针时要十分小心，方向尽量由后上向前下以减小血管神经束损伤的风险，而且螺钉外露的螺纹不宜过长，一般以1到2个螺纹为宜。只要注意锁骨及其重要毗邻结构的解剖特点，体外钢板固定治疗锁骨骨折的安全性是有保障的。

Objective　To explore anatomic features, adjacent structures and the projection of the clavicle, and provide anatomic basis for treating clavicle fracture through the external plate fixation.　Methods　15 adult cadaveric specimens (30 sides) were selected to respectively observe subclavian vessels, brachial plexus, the clavicle and coracoid process. The projection area of the subclavian vessels, brachial plexus on the clavicle was measured and compared.　Results　Projection area of the neurovascular bundle was at the medial and middle 1/4 segment of the clavicle. Minimal distance from neurovascular bundles to the lower edge of the clavicle was about 0.42 cm and 0.57 cm at the left and right sides respectively.　Conclusions　During the fixation procedure using the external plate, the hole drilling on the medial and middle 1/4 segment of the clavicle should be careful and directed postsuperiorly to anteroinferierly, and the length of screw have to be considered, for protecting adjacent neurovascular bundles.