<prompt> Reasons for preference of internal jugular vein over external jugular vein for measurement of JVP include all exceptIJV is in direct continuation with right atriumIncreased sympathetic activity in IJVEJV passes through more facial planesProminent valves at proximal portion of EJV  <response>: Increased sympathetic activity in EJV causes vasoconstriction of EJV , so pulsations become barely visible. 