The bladder has an annular form and a pair of opening extending through the bladder in {HEAD ~ the axial direction} of {TAIL ~ the bladder} 
of
The bladder has an annular form and a pair of opening extending through the bladder in { HEAD ~ the axial direction } of { TAIL ~ the bladder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL