Dear Macarena,
You could use the n30r83 Hammersmith atlas http://brain-development.org/brain-atlases/adult-brain-maximum-probability-map-hammers-mith-atlas-n30r83-in-mni-space/ (probabilistic), the Neuromorphometrics labels included in SPM12, or the Oxford-GSK-Imanova structural and connectivity striatal atlases (see http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Atlases/striatumconn and http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Atlases/striatumstruc , in your case probably the latter).
The labels are meant to be in MNI space, but make sure that they correspond reasonably well to your preprocessed data, as different preprocessing strategies (template normalisation, normalisation-segmentation) will result in somewhat different MNI "versions". For the n30r83 atlas individual anatomies and labels in native space are provided as well, so you could re-preprocess them to increase overlap.
Best
Helmut
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