There are reliable anastomosis among RCA, RRA, RIA on the radial side of the elbow joint and SUCA, IUCA, URA on the ulnar side of the elbow joint.

• 桡侧副、桡侧返、骨间返动脉在肘关节桡侧有恒定的吻合,尺侧上副、尺侧下副、尺侧返动脉在肘关节尺侧有恒定的吻合。