I am just starting teaching, but when I tutored bio and A&P, a really helpful tactic I employed was getting my students to realize that they carried their own model with them -- their own body. If you want to know the action of the bicep muscle, just flex your bicep! Which side is the bigger bone in the leg on? Just feel it, during the test, it's not cheating! Another cool group project that we did was assign muscle groups - arm, leg, back, etc - to a group and have them choose one person to be the model. (Hopefully a thin, more muscular person.) Then they used washable markers to draw the muscles on the person's body. It was highly effective and a lot of fun.