All the MRI investigations were performed with the subject in the supine position in a 0.5 T MRI scanner (GE Medical Systems, Waukesha, Wisconsin). The subjects were advised not to swallow and not to move while assuming a neutral or nonsmiling posture. Of the 11 subjects, 4 consented to undergo a second MRI while assuming a smiling posture. A multiplanar localizing sequence, followed in sagittal and coronal orientation using a turbo spin echo sequence, was performed for determining structure volumes. The total acquisition time was 10 minutes. Volumetric calculations were performed using a 3-dimensional (3D) image analysis application (Dextroscope, Volume Interactions, Republic of Singapore) to circumscribe areas, orient dimensions, and calculate volumes of the MFP. The MRI data were imported into the virtual reality environment and rendered as a 3D object in a monoscopic or stereoscopic view using proprietary glasses. A line measurement tool was used to manually circumscribe the MFP in the sagittal plane per image slice. A volume tool automatically estimated the volume of the previously configured sagittal slices in cubic centimeters. The computation of the volume takes into account all voxels with a transparency value greater than 0.01 (transparency range, 0-1.0). The volume of the MFP per subject was calculated and compared across the case series in terms of sex, BMI, and differences between the right and left sides. The volumes in neutral position were compared with those in the smiling position per subject. The horizontal and vertical distances and anterior-posterior (A-P) depth of the MFP were compared in neutral and smiling positions.