1995年Hack等人首次提出肌硬膜桥的概念,此结构是位于枕下区深层肌和硬脊膜之间相连接的结缔组织桥。目前关于肌硬膜桥的形态学和功能学研究已成为热点,并有研究提出肌硬膜桥与慢性颈源性头痛有关,表明肌硬膜桥可能具有重要临床意义。作为重要结构,肌硬膜桥是否具有高度保守性,尚未见报道。本文以暹罗鳄为代表,对爬行类动物的枕下区解剖结构进行了观察,发现暹罗鳄的前寰椎浅面覆盖3块肌, Hack et al. First proposed the concept of myotome in 1995, a connective tissue bridge located between the deep subdural region and the dura. At present, morphological and functional studies of myoflumblags have become a hot topic. Some studies have suggested that myocutaneous bridges are associated with chronic cervical headaches, suggesting that myocutaneous bridges may have important clinical implications. As an important structure, whether the muscular dural bridge is highly conserved, has not been reported. In this paper, the representative of the Siamese crocodile, reptiles on the suboccipital anatomy was observed and found that the Siamese crocodile covered the shallow surface of atlas three muscles,