This dataset contains models, MRI data, and code associated with "A model of tension-induced fiber growth predicts white matter organization during brain folding" in Nature Communications (accepted 27 Oct 2021). Included files: NatCommMRIdata.zip - MRI data and associated MATLAB code for analysis of each subject folding_with_fibers.mph - model file used to generate results in Main Text. Modifiable parameters include stress-dependent fiber elongation rate, initial fiber volume fractions, initial geometry, and cortical growth rate. Compatible with COMSOL Multiphysics (version 5.3). folding_with_fibersECM.mph - model file corresponding to Supplementary Fig. 2. Compatible with COMSOL Multiphysics (version 5.3). folding_with_fibers_linear.mph - model file corresponding to Supplementary Fig. 3. Compatible with COMSOL Multiphysics (version 5.3).