目的　探讨趾长屈肌的亚部划分，为临床外科“半肌”移位手术提供解剖学基础。  方法　大体解剖法、肌构筑法、改良Sihler’s 染色法。 结果　①可依劈开趾长屈肌肌内腱板，把该肌分为胫侧和腓侧两个亚部；②胫侧亚部各构筑学值大于腓侧亚部；③两亚部存在单独神经支配。  结论　①趾长屈肌可分为胫侧亚部和腓侧亚部，两亚部有独立的神经支配；②趾长屈肌的两个亚部均为半羽肌，胫侧亚部产生的肌力大于腓侧亚部。

Objective    To reveal morphologic features of human flexor digitorum longus (FDL) for clinical application.　Methods　Muscle architecture skill and modified Sihler's staining were used in this study.　Results　①The FDL could be divided into tibial and fibula compartments by the instramuscular tendon; ②The values of muscle architecture of tibial compartment of FDL were bigger than those of the fibula compartment; ③Tibial compartment and fibula compartment were innervated respectively.　Conclusions　 ①The FDL can be divided into tibial and fibula compartments, with independent nerve innervation; ②Two compartments formed by the half pinnate muscle, however, muscle strength of tibial compartment is more strong than that of fibula compartment.