Here it is folks, the only useful app I've found for learning the brainstem anatomy. The major apps don't include the nuclei or tracts, basically leaving it at "pons, medulla, midbrain" level.
I can't read the language, which I believe is Chinese, but the regions are labeled in English and I'm figuring out the buttons. Really it's no less intuitive than the unlabeled icons that you're supposed to memorize in the pro apps.
Try it out, it's amazingly free, even if you can't read the language.