B757 FO REPORTS ENCOUNTERING TURBULENCE DURING DESCENT CAUSING INJURY TO A FLT ATTENDANT. FO REQUESTS MEDICAL PERSONAL MEET ACFT WHICH DOES NOT HAPPEN.

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WE HIT AN AREA OF TURB WHILE BEING VECTORED FOR APCH BY TRACON. WE WERE IN THE CLOUDS AND BOTH HAD THE RADAR SELECTED WHICH DID NOT INDICATE ANY TURB OR WX IN OUR FLT PATH. THE TURB WAS MODERATE AND ONLY A FEW SECONDS IN DURATION. I PRESSED THE FLT ATTENDANT CALL BUTTON TO ASK THE FLT ATTENDANTS IF EVERYONE WAS ALRIGHT. I HEARD THE PURSER TALKING TO THE OTHER FLT ATTENDANTS REGARDING A FLT ATTENDANT THAT HAD BEEN INJURED IN THE BACK GALLEY. I CUT INTO THE CONVERSATION AND INQUIRED AS TO WHAT HAPPENED. HE SAID FLT ATTENDANT X HAD BEEN INJURED AND WAS ON THE GND IN THE BACK GALLEY BEING ATTENDED TO BY ANOTHER FLT ATTENDANT WHO WAS A TRAINED NURSE. I SENT 2 MESSAGES TO ZZZ STATION VIA ACARS REQUESTING MEDICAL PERSONNEL MEET THE ACFT. AS WE WERE BEING VECTORED FOR APCH; THAT WAS ALL I HAD TIME FOR. UPON LNDG I CHKED IN WITH ZZZ OPS TO MAKE SURE MEDICAL WOULD MEET THE ACFT. I MADE A PA TO THE PAX TO PLEASE REMAIN SEATED UNTIL THE MEDICAL PERSONNEL ATTENDED TO THE INJURED FLT ATTENDANT. ZZZ OPS SAID THAT AN INFLT SUPVR WAS MEETING THE AIRPLANE. I ASKED WHY MEDICAL WAS NOT MEETING US AND THEY SAID DISPATCH HAD CALLED AND SAID TO HAVE A SUPVR MEET THE PLANE. I ASKED IF THEY GOT MY STATION MESSAGES AND THEY SAID THEY HAD NOT. ULTIMATELY IT TOOK 10 MINS FOR MEDICAL PERSONNEL TO ARRIVE AT THE AIRPLANE AND SEE TO THE INJURED FLT ATTENDANT.