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