ZME CTLR DESCRIBED UNEXPECTED TAKEOVER OF BNA AIRSPACE WITH NO TRAINING AND OPS PLAN.

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I WAS WORKING LOW ALT SECTOR (3 LOW ALT SECTORS COMBO). THIS SECTOR OVERLIES NASHVILLE APCH AIRSPACE. AT ABOUT XA30 I WAS TOLD BY THE SUPVR THAT BNA WAS GOING DOWN TO 1 CTLR BECAUSE OF AN EMER (NO PERSONNEL) AND I WOULD ASSUME BNA AIRSPACE. THIS HAS NEVER HAPPENED BEFORE; NOR HAS ANYONE AT ZME HAS BEEN TRAINED ON THE PROCS FOR WORKING INSIDE BNA'S AIRSPACE. WE LOOKED EVERYWHERE FOR THE CONTINGENCY PLAN FOR NASHVILLE APCH AIRSPACE; IN HOPES OF FINDING SOME GUIDANCE; WE COULD NOT FIND ANY. THAT'S BECAUSE; THERE IS NO CONTINGENCY PLAN FOR NASHVILLE APCH AIRSPACE! IT SHOULD BE NOTED THAT ZME AREA 5 HAS BEEN UNDERSTAFFED ON THESE SHIFTS SINCE JAN/XA/07. WE ARE NOW STAFFED WITH ONLY 3 CTLRS ON THESE SHIFTS AS OPPOSED TO OUR NORMAL 4 CTLRS PRIOR TO 2007. WE ARE NOW BEING TASKED TO POTENTIALLY WORK MORE AIRSPACE (IF BNA GOES ATC ZERO); WITH LESS CTLR STAFFING. THIS ON TOP OF THE FACT THERE IS NO CONTINGENCY PLAN FOR NASHVILLE APCH AIRSPACE. IT SHOULD ALSO BE NOTED NO ZME CTLRS HAVE EVER BEEN BRIEFED NOR TRAINED ON THE AIRSPACE INSIDE BNA.