To ensure the example works as described, confirm that you have Maya Muscle loaded. The Muscle menu displays in the main menu bar if Muscle is loaded. If you need to load Muscle manually, see Load Maya Muscle. It is recommended that you save your work periodically and at the end of each section as you progress through this tutorial, however sample files of the finished scene for each example are also included.
www.autodesk.com/maya-advancedtechniques