目的  通过对腰骶段多裂肌进行应用解剖研究，为临床减少腰椎后路手术对脊柱功能影响提供参考资料。  方法  对25具尸体多裂肌的起、止点、肌束的构成、与周围组织结构的关系、多裂肌短腱与止点及其与棘突和棘间韧带的关系进行解剖测量。  结果  多裂肌浅层起于骶髂长韧带，有一部分起于髂后上棘内侧，深层起于骶骨椎板、骶髂短韧带。L1~5多裂肌短腱的长度分别为：(15.10±2.43)、(15.68±2.79)、(14.82±2.77)、(14.16±3.62)和(11.58±2.46)mm。L1~5多裂肌短腱的宽度分别为：（4.72±0.99）、（5.42±1.14）、（5.86±0.99）、（5.90±1.06）和（4.68±0.62）mm。  结论   多裂肌主要参与脊柱背伸运动，维持脊柱腰段前凸的存在，是脊柱动力性稳定的重要因素。

        Objective  To study anatomic features of the lumbosacral multifidus muscle and provide reference for reducing spinal injury during posterior lumbar surgery.  Methods  25 corpses were dissected. The origin, insertion, the construction of muscle bundle, and the relationship with adjacent structures of multifidus muscle were observed and measured. Results   The superficial part of the multifidus muscle originated from long sacroiliac ligament, and the medial side of posterior superior iliac spine, however, the deep ones from the sacral plank and sacroiliac short ligament. The width of short tendon of L1-5 multifidus muscle were respectively (15.10±2.43), (15.68±2.79), (14.82±2.77), (14.16±3.62) and (11.58±2.46)mm. The width of it were respectively (4.72±0.99), (5.42±1.14), (5.86±0.99), (5.90±1.06) and (4.68±0.62)mm.  Conclusions   Multifidus muscle is one of key elements to keep the stability of the spine, for it participates in the dorsal extension of vertebral column and the maintenance of lumbar spine lordosis.