THE "EX" FILES
'(<a href="http://www.j-archive.com/media/2010-03-31_DJ_06.wmv">Kelly of the Clue Crew bends her right fingers and arm.</a>)  Flexor muscles allow you to bend joints, like curling your fingers or bending your arm at the elbow; the muscles that straighten the joints are this opposite type'
the extensors