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