I think it's just a bonus object, like if you do science and medicine you get the skeleton. I think it's more so to help your knowledge on the subject, I could be wrong and sorry if I am misinforming you, that's just what I've taken from using the skeleton.
EDIT: I just found this
Q18) What are the new study objects? Which degrees are they linked to and what function do they perform?
Argus: There are several new study objects available with the different degree topics. For the Business degree there is a business planner. The Science and Medicine degree has a Anatomy Skeleton. And for Technology there is a Brain Enhancement Machine. These study objects help the Sims build skills and helps boost their grades up! (credits to:
http://gb.thesims3.com/community/bl...l?blogid=486448)