伸膝时，防止胫骨向前移位的是（） ["内侧半月板","后交叉韧带","外侧半月板","前交叉韧带","关节软骨"] 恐惧感和危险感产生的压力是属于哪种压力源？（） ["心理性触发；","物理性刺激；","社会性触发；","文化性触发。"] 防止脊柱过分后伸的结构是（） ["黄韧带","前纵韧带","椎间盘","棘上韧带","项韧带"] 大脑半球所需血液的80%来自（） ["大脑中动脉","大脑前动脉","大脑后动脉","后交通动脉","脑桥动脉"] 脑脊液存在于（） ["硬膜下腔","蛛网膜下腔","硬膜外隙","硬脑膜静脉窦","颅内静脉"] 硬膜外腔位于（）