Forum:The Reapers and the Citadel

We all know that the Reapers use the Citadel as a giant mass relay to enter the Milky Way, and to "decapitate" galactic governments. We also know that the basic functions of a mass relay includes aligning itself with the target relay, potentially allowing multiple relays to "target" the same relay (since it appears that the Sword Fleet is coming from several relays across the galaxy, unless I'm mistaken).

The question is: does the Citadel have a corresponding relay(s) in dark space? Looking at how the relays of the galaxy work, it would make sense that there should be at least one on the other end-possibly more.

On a side note, would the destroy-control-synthesis wave travel to those relays as well?