【名词&注释】
动作电位(action potential)、侧卧位(lateral position)、膜电位(membrane potential)、神经末梢(nerve ending)、相结合(combination)、控制性低血压(controlled hypotension)、膜去极化(membrane depolarization)、终板电位(endplate potential)、肌细胞膜(myolemma)、最高点(highest point)
[单选题]Which is true on the subarachnoid space in the vertebral canal()。
A. lies between dura matter and arachnoid
B. up to subarachnoid space in the skull by the foramen magnum
C. down the the height of the fifth sacral vertebral
D. terminal cistern is formed by the space below the second sacral vertebral
E. the fluid in it can communicate with that in the center canal of spinal cord directly