A thumb portion secures to the anterior portion and to the fourchette, with {HEAD ~ the fourchette} extending between the thumb portion and {TAIL ~ the posterior side} 
extending between
A thumb portion secures to the anterior portion and to the fourchette , with { HEAD ~ the fourchette } extending between the thumb portion and { TAIL ~ the posterior side }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL