Objective  To observe the form of fibers connection of myodural bridge (MDB) between the rectus capitis posterior minor muscle (RCPmi) and the posterior atlanto-occipital membrane (PAOM), the PAOM and the spinal dura mater (SDM) in the atlanto-occipital space of dogs with scanning electron microscope (SEM).   Methods  The dense connection tissues (MDB) among the RCPmi, PAOM and SDM of six dogs were scanned with a SEM. The form of fibers connection between the RCPmi and PAOM, the PAOM and SDM in the atlanto-occipital space was observed, photographed, and documented.   Results  The MDB fibers connection existed between the RCPmi and the PAOM, and between the PAOM and the SDM. The MDB fibers between the RCPmi and the PAOM were parallelly arranged and inserted into the PAOM at an acute angle, and continued into the superficial layer of the back of PAOM. The MDB fibers between the PAOM and the SDM converged into several bundles. Each MDB bundle was covered by membrane. This membrane became continuous with the superficial membrane of SDM, meanwhile fibers of the membrane were interwoven with the surface fibers of SDM.   Conclusion  The interweaving fibers of the MDB with the SDM indicates that MDB fiber may withstand great tension.