When you hold your cursor over each of the numbers in this graphic, a portion of the muscle will be highlighted, and you'll see a drop-down menu with a list of options. I want you to identify the structure that's highlighted by clicking on the appropriate term in the list. You'll choose the right term for one structure at a time; I'll give you feedback on your answer and then you can come back and try another one. When you've correctly identified all six structures, click Next and I'll have you do another activity to test your knowledge of anatomy.