Conclusion We found that the fascial arch of the opponens digiti minimi can compress the deep branch of the ulnar nerve causing motor deficit of the intrinsic muscles of hands.

• 结论 小指对掌肌腱弓可以卡压尺神经深支，引起除小鱼际肌以外的尺神经支配的所有手内在肌的功能障碍。