I have no idea how I made it through all those years of science education and never dissected anything (oh, in one biochem lab we had to isolate proteins from rat livers, but my lab partner was a biologist and she did the actual dissection). Regardless, cutting into a frog, or a fetal pig, is a common activity in both high school and college science to teach students the details of anatomy. Some have argued that the educational value of this is overrated, and have proposed virtual dissections or other alternatives. Dave Kaleta came up with another solution, a LEGO dissected frog. If you look close, you can clearly see the heart, the lungs, the liver and the spine. There are a couple of elements I don't recognize, but given the authenticity of the rest, I'm sure Dave was working to closely emulate his source material.
BTW, in looking around the web, I've seen some other interesting variations, such as a knitted frog. That one also led to another interesting blog, the Art of Science, that I'm going to have to read more closely.