Colours: blue = MIC, red = mental canal (the anterior opening of the mandibular canal) yellow = mandibular canal.
1 = distance from MF to midline of the mandible (approximate distance 28 mm);
2 = distance from MF to the inferior border of the mandible (14 to 15 mm);
3 = possible MF location zone in the horizontal plane in relation to the roots of teeth;
4 = the shape of MF can be round or oval, the diameter is 1.68 to 3.5 mm;
5 = prevalence location of MF in the horizontal plane for Caucasian population;
6 = prevalence location of MF in the horizontal plane for Mongoloids and African people.