ventral surface of the brain stem Midbrain Crus cerebri大脑脚底 interpeduncular fossa脚间窝 oculomotor nerves动眼神经 emerge from medial of crus cerebri Posterior perforated substance后穿质Crus cerebri 大脑脚底 Interpeduncular fossa 脚间窝 oculomotor nerves 动眼神经 emerge from medial of crus cerebri ventral surface of the brain stem Midbrain Posterior perforated substance 后穿质