The folded lead is advanced until {HEAD ~ the distal end} of the lead passes the entrance to {TAIL ~ the interior jugular vein} 
The folded lead is advanced until { HEAD ~ the distal end } of the lead passes the entrance to { TAIL ~ the interior jugular vein }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL