for m=1:10
figure
for n=1:8
subplot(2,4,n)
plot(MM(:,n,m));
end
end
The above plots each against the ordinal position in the column for columns 1:8 of each plane.
If there's an X variable that you've not identified against which to plot, add it in the X argument position in the call to plot() and adjust the indices to the Y argument as needed.