I’m guessing I’m missing something obvious but...where is the spleen? I get the impracticality of showing lymph nodes but, the spleen? Kind of important. The heart is shown in way that does not visualize 4 chambers...there is no septum that I can find. Wasn’t too thrilled about the brain, either. I think a little more specificity would not be asking too much. So, I am unable to find some basic body parts. I am hopeful that this is my own failure. I think a program like this should be able to meet the basic standard set by physical, take-apart, 3-D models. As it stands, with such basic parts missing, I can only give 3 stars. I’ll update if it turns out this is all my fault in navigating the program. Maybe you get the extra body parts if you pay for premium or something? Dunno....