Results: 1. MC was a extradural recess in the posterior of the middle fossa, it contained subdural space, arachnoid, subarachnoid space, trigeminal ganglion, neural fibers and cerebrospinal fluid, et al; 结果:(1)MC为颅中窝后部的硬脑膜陷窝,包含硬膜下腔、蛛网膜、蛛网膜下腔、三叉神经节、神经纤维和脑脊液等结构;