image data orientation

[gjarvis at synapse.net]

I can not find any information on image orientation in fits standard, just how 
memory is organised as first dimension varies fastest.
For example a two dimensional image:

1) is NAXIS1 corresponds two vertical rows of image and NAXIS2  corresponds 
to horizontal columns of data image or is it column row?

2) is data[1,1] top left, or top right, or bottom left, or bottom right of image?

What about higher dimensions