AN MD80 FLT CREW FORGOT TO CHIME GOING THROUGH 10000 FT AND FORGET TO XMIT THE 'FLT ATTENDANT BE SEATED' ANNOUNCEMENT.

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A FLT ATTENDANT MAY HAVE BEEN INJURED DURING LNDG. I FORGOT TO MAKE THE 'FLT ATTENDANTS PLEASE BE SEATED' ANNOUNCEMENT; WHICH I TYPICALLY MAKE PASSING 7000 FT. TO COMPOUND THE PROB; THE CAPT FORGOT TO RING THE CHIMES PASSING 10000 FT AND OBVIOUSLY; WE DIDN'T CATCH EACH OTHER'S ERRORS. WE WERE ON DOWNWIND AND BEING VECTORED TO CAT 3 FINAL WHEN THESE OMISSIONS OCCURRED. WE PUT THE GEAR DOWN AT ABOUT 9 DME AND WERE FULLY CONFIGURED AND ON-SPD. WE BROKE OUT RIGHT AT CAT 3 MINIMUMS FOR A SMOOTH AUTOLAND WITH HGS MONITORING. AFTER THE PAX DEPLANED; THE 'A' FLT ATTENDANT ASKED THE CAPT IF WE'D GIVEN THE AFOREMENTIONED WARNINGS. HE THOUGHT BACK AND SAID THAT WE DIDN'T; THEN APOLOGIZED. SHE SAID THAT ONE OF THE FLT ATTENDANTS WAS INJURED. I DIDN'T TALK TO THE FLT ATTENDANTS; AS I WAS STILL IN THE COCKPIT. I DON'T HAVE ANY FLT ATTENDANTS' NAMES AND I DON'T KNOW THE EXTENT OF ANY INJURIES. I DID SEE ALL THE FLT ATTENDANTS CARRY THEIR BAGS OFF THE AIRPLANE. OF COURSE; IF WE'D MADE THE REQUIRED ANNOUNCEMENTS; THE EVENT LIKELY WOULDN'T HAVE HAPPENED. HOWEVER; I FEEL IF SOME SORT OF SITUATIONAL AWARENESS TYPE TRAINING WE ADDED TO FLT ATTENDANT SCHOOL; IT MIGHT HELP PREVENT THESE TYPE PROBS. FOR EXAMPLE; THEY SHOULD BE TAUGHT TO SIT IN THE NEAREST SEAT IF THEY HEAR THE GEAR GO DOWN. THERE IS NO REASON FOR ANYONE TO BE WALKING AROUND AFTER THE GEAR IS DOWN; EVEN IF THE GEAR IS USED FOR DRAG TO HELP THE DSCNT.