How to find the structure name of the internal table dynamically ?

Hi all,

Kindly suggest a function module or any other way to find out the structure name of the internal table.

eg.,

data : it_mara type standard table of mara with header line.

if i pass input as it_mara then my output should be MARA.

is there any standard function module available for it?

Kindly suggest some ideas.

Regards,
Muthu