dorsal surface of the brain stem 脑干背面 Midbrain Superior colliculus上丘 centers of visual flexes视觉反射中枢 Inferior colliculus下丘 conduct auditory sensation传导听觉 Trochlear nerve滑车神经 Brachium of superior colliculus 上丘臂 Brachium of inferior colliculus 下丘臂Superior colliculus 上丘 centers of visual flexes 视觉反射中枢 Inferior colliculus 下丘 conduct auditory sensation 传导听觉 Trochlear nerve 滑车神经 dorsal surface of the brain stem 脑干背面 Midbrain Brachium of superior colliculus 上丘臂 Brachium of inferior colliculus 下丘臂