Synovial Joints (III)
6.   Ball and socket joint
Ž   flexion/extension,
      adduction/abduction,
      circumduction, and rotation
5.   Saddle joint
Ž   Similar to ellipsoidal joint,
      but freer
[First carpometacarpal joint]
[Glenohumeral joint]
“Form Follows Function”
Illustrations: http://www.science.ubc.ca/~biomania/tutorial/bonejt/intro.htm