Glimmerglass’ video on Red Rum brought up this really interesting video on youtube:
http://www.youtube.com/watch?v=QsvS6gEBJuE&NR=1&feature=endscreen
Beware if you are squeamish. The video involves a necropsy of a racehorse with interesting explanations of function of parts of the body. The video includes history of the Thoroughbred.
I was a little grossed out when they cut a tendon under stress, but it is a good illustration of what happens when a horse over reaches.