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