Hello Bala,
I was able to execute the code posted by you, with a dummy Word file containing a table.
The contents of the table (in the Word file) can be seen in the following screenshot: 
The contents of the "tblVals" cell array can be seen in the following screenshot:
Thus, the "tblVals" cell array contains the table headers as well and you can access these.
Hope this helps.
Regards,
Prateek.