Fig. 9. Comparison of mid-sagittal magnetic resonance images (MRIs) (left) and superimposed mid-sagittal outputs (right) from the model. The frames shown are from sequence 7732-S3, frame 17 (A), sequence 7732-S3, frame 24 (B), and sequence 7732-S3, frame 35 (C). The outline of the odontophore, the outline of the radular stalk and the overall outline of the buccal mass were initially extracted from the MRIs shown on the left. The dorsal and ventral cross sections of the model I3 rings were placed by the model.