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