opt[optic_tract]	1
lgnf[white_matter_circumvent_LGN]	2
ss[sagittal_stratum]	3
strk[stratum_calcarinum]	4
ovf[occipital_vertical_fasciculus]	5
olfv[occipital_local_fibers_ventral]	6
olfd[occipital_local_fibers_dorsal]	7
olfm[occipital_local_fibers_medial]	8
sod[supraoptic_decussation]	9
cr.cc	10
cr.ic	11
cr.sfl	12
cr.ec	13