{HEAD ~ The outer part} 12b of {TAIL ~ the base joint} is fixed to one end of a lower arm 14 
of
{ HEAD ~ The outer part } 12b of { TAIL ~ the base joint } is fixed to one end of a lower arm 14
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH