This game summarizes itself pretty well with this disambiguation text: 
 
"Which do you mean, lymph nodes generally, the inguinal lymph nodes, the supraclavicular lymph nodes or the cervical lymph nodes?" 
 
This is a game written by two medical students for the 2005 IFComp. They wanted to show exactly what it was like being a medical student, and they succeeded (as far as I know!) The game comes with both images and sound. 
 
It's polished and descriptive, but there's no emotion and it's too confusing to be as interactive as I'd like. I played it quite some time ago, but for some reason I never reviewed it.