视觉性语言中枢()运动性语言中枢() ["A．优势半球额下回后部 ","B．优势半球角回 ","C．优势半球额上回后部 ","D．优势半球额中回后部 ","E．优势半球颞上回后部"]
股神经支配() ["A．股二头肌 ","B．股四头肌 ","C．缝匠肌 ","D．半腱肌 ","E．半膜肌"]
靶区
关于坐骨神经的描述，下列各项正确的是() ["A．是全身最粗、最长的神经 ","B．经梨状肌下孔出盆腔 ","C．在腘窝上方分为胫神经和腓总神经 ","D．支配股二头肌、半腱肌和半膜肌 ","E．在坐骨结节与大转子之间下行"]
试述脑脊液产生及循环途径。
简述CT工作原理。
