ventral surface of the brain stem Pons Basilar part基底部 Basilar sulcus基底沟 Bulbopontine sulcus 延髓脑桥沟: from medial to lateral abducent,n展神经 facial n vestibulocochlear n.前庭蜗神经Basilar part 基底部 Basilar sulcus 基底沟 ventral surface of the brain stem Pons Bulbopontine sulcus 延髓脑桥沟: from medial to lateral, abducent, n 展神经 facial n. vestibulocochlear n. 前庭蜗神经