20 腦脊髓液(cerebrospinal fluid)存在於①第三腦室(third ventricle)②第四腦室(fourth ventricle)③
側腦室(lateral ventricle)④大腦導水管(cerebral aqueduct)⑤室間孔(interventricular foramen)⑥
上矢狀竇(superior sagittal sinus),其正常的流動順序為:
(A)①→⑤→②→④→③→⑥
(B)①→④→②→⑤→③→⑥
(C)③→④→①→⑤→②→⑥
(D)③→⑤→①→④→②→⑥