You can look at the muscles in a human leg here. This requires the shockwave plugin and a 3d capable computer. It allows you to zoom in and out and spin the model. You can click on the various muscles to see what they are called. Another version with the insertion points and more technical detail will soon be available and a model with the groups of muscles is available below. This lets you show and hide various groups and is recommended if you are teaching. If you spin any of the models you are advised to turn on the light first. To reset the model press the F5 key on your keyboard.

Alternative version