http://www.personal.psu.edu/faculty/j/a/jas43/skel/skeletal.htm
http://www.rad.washington.edu/RadAnatomy.html
http://ligwww.epfl.ch/~maurel/CHARM/WP3/Anatomy.html
http://www.meddean.luc.edu/lumen/meded/grossanatomy/learnem/bones/main_bone.htm
http://www.eskeletons.org/