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