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