ventral surface of the brain stem Pons Middle cerebellar peduncle小脑中脚, Trigeminal nerve三叉神经 Pontocerebellar trigone 脑桥小脑三角 the junction of medulla, pons and cerebellumventral surface of the brain stem Pons Middle cerebellar peduncle 小脑中脚 Trigeminal nerve 三叉神经 Pontocerebellar trigone 脑桥小脑三角: the junction of medulla, pons and cerebellum