目的　进一步完善腕后区第4骨纤维管道的解剖结构，探讨其临床意义。  方法　在头戴式放大镜下，对15具尸体标本30侧上肢的腕后区第4骨纤维管道的顶、底、出入口、内外侧壁及内容物进行了解剖，并测得相关数据。  结果　伸肌支持带构成腕后区第4骨纤维管道的顶；底由桡尺远侧关节背侧及腕关节背侧关节囊近端及其表面的深筋膜构成；内外侧壁均由伸肌支持带向深面发出的肌间隔构成；入口介于尺骨头与桡骨远端背侧之间，而出口位于腕关节近端背侧；管道内走行5根肌腱，包括指伸肌腱的示指、中指、环指、小指的分支和示指伸肌肌腱，1条血管神经束即骨间后神经终末支及骨间前动脉终末支桡侧分支。  结论　详细描述了管道顶、底、两口、内外侧壁及毗邻，管道内容物及层次，对临床腕背痛的诊断以及避免管道内容物医源性损伤具有重要意义。

Objective　To further improve the anatomic structure of the the fourth bony fiber tunnel in the dorsal side of the wrist, and explore its clinical significance.　Methods　With the help of the head-mounted magnifier, the roof, bottom, entrance and exit, inner and outer walls and contents of the fourth bony fiber tunnel at the area of dorsal wrist from 15 cadavers (30 sides) were dissected, and the relevant data were measured.    Results    The extensor retinaculum constituted the roof of the fourth bony fiber tunnel at the area of dorsal wrist; The base consisted of the deep fascia at the proximal end of the distal limit of the distal joint and the dorsal joint capsule of the wrist joint; The inner and outer side walls were composed of muscular septum extending from extensor retinaculum to deeper; Entry was between the head of ulna and dorsal side of the distal radius, and exit was at the dorsal side of the wrist; 5 tendons, including index finger, middle finger , ring finger, little finger branches of extensor tendons and index finger extensor tendons, 1 vascular nerve bundles, which is terminal branch of the posterior interosseous nerve and terminal branch of the anterior interosseous artery.     Conclusion    The roof, bottom, entrance and exit, inner and outer side walls, the adjacent and the contents and levels of the tunnel were described in detail, which is of great significance for the diagnosis of clinical wrist pain and avoiding iatrogenic injury of the contents of the tunnel.