31. 後下小腦動脈(posteroinferior cerebellar artery)通常起源自：
(A)基底動脈(basilar artery)
(B)髓前動脈(anterior spinal artery)
(C)椎動脈(vertebral artery)
(D)大腦中動脈(middle cerebral artery)

答案：登入後查看
統計： A(0), B(0), C(4), D(0), E(0) #897103