You'll need a browser with WebGL support to use the Google body browser, but if you have one, it's pretty amazing. The thumbnail at the left is a snapshot of the muscle layer looking at the right side of a human body. (Click on the image for a full-size screenshot captured with Google Chrome.)
You can zoom in, rotate, focus on muscles, organ systems, the circulatory system, or the nervous system. You can turn on labels (as I have here) or leave them turned off. If you ever want to see where your teres minor is (top left in this image), now you can find it.