{TAIL ~ The bladder} is adapted to apply a pressure substantially perpendicular to {HEAD ~ the cavity wall} 
{ TAIL ~ The bladder } is adapted to apply a pressure substantially perpendicular to { HEAD ~ the cavity wall }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD