Comparison of Skull Image

Presented is a volume rendering of skull forms of C57BL/6 wild-type mice of different sexes and ages (left panel) and DDR2−/−, DDR1−/−, and DDR2+/− mice (right panel). Displayed are distances and representative features of the skeleton of the head viewed from the right side. D₁ represents the maximal distance between the external occipital protuberance and the incisor teeth. The distance between the center of the inner ear and the incisor teeth is labeled D₂, whereas D₃ delineates the distance between the center of the inner ear and the external occipital protuberance. C₁ depicts the bend of parietal, interparietal, and occipital bone and is measured as sum of the local contour curvature. The landmark F₁ symbolizes the nasal bone.