A fourchette secures {TAIL ~ portions} of {HEAD ~ the perimeter} of the anterior and posterior portions to one another 
A fourchette secures { TAIL ~ portions } of { HEAD ~ the perimeter } of the anterior and posterior portions to one another
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH