{HEAD ~ Joints} between {TAIL ~ the fourchette} and the anterior and posterior portions maintain an opening formed by the cuff in an open position 
{ HEAD ~ Joints } between { TAIL ~ the fourchette } and the anterior and posterior portions maintain an opening formed by the cuff in an open position
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH