{HEAD ~ a tubular body} which defines {TAIL ~ said passage}, the tubular body having an opening on the distal end therethrough 
defines
{ HEAD ~ a tubular body } which defines { TAIL ~ said passage } , the tubular body having an opening on the distal end therethrough
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH