Negative voltage at node 38 is obtained from a negative voltage appearing at {HEAD ~ node} 25 for {TAIL ~ application} to gates of pull up and pull down transistors 42 and 41, as is explained in more detail elsewhere herein 
for
Negative voltage at node 38 is obtained from a negative voltage appearing at { HEAD ~ node } 25 for { TAIL ~ application } to gates of pull up and pull down transistors 42 and 41 , as is explained in more detail elsewhere herein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH