In one embodiment, {HEAD ~ the fourchette} extends to the edge of an opening formed by the fourchette and {TAIL ~ the anterior and posterior portion} 
In one embodiment , { HEAD ~ the fourchette } extends to the edge of an opening formed by the fourchette and { TAIL ~ the anterior and posterior portion }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL