Typically for a single transistor only one surface of each drain and source region make {TAIL ~ direct contact} to the semiconductor body and {HEAD ~ these surfaces} are on opposite sides of a channel region of each transistor 
Typically for a single transistor only one surface of each drain and source region make { TAIL ~ direct contact } to the semiconductor body and { HEAD ~ these surfaces } are on opposite sides of a channel region of each transistor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH