Homologous  structures.  Even  though these anatomical structures have
   been adapted for different functions, the forelimbs of all mammals are
   constructed from the same skeletal elements:
   one  large  bone,  attached  to two smaller bones, attached to several
   small bones, attached to phalanges.
<P>
   Reconstructing Forelimbs activity:  <A ClAsS=ACT Href="http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?22&amp;C" oNClick="popact('http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?22&amp;C');txtcolor('homology1','gray');return false;" Id=homology1><iMg sRc="/images/tutorial.gif" aLt='' boRDer=0></A>