Fig. 7.

Three dimensional and quasi-two dimensional models. In a) the most accurate representation of the turtle utricle is shown: the Curved macular surface with Varying layer thickness 3 Dimensional (CV3D) model. Each of the variations within the 3D set either removes the curvature from the macular surface or averages the layer thickness of each of the layers, while holding the macular perimeter as a constant. The remaining 3D models are the: b) Curved macular surface with Constant layer thickness 3 Dimensional (CC3D) model; c) Flat macular surface with Varying layer thickness 3 Dimensional (FV3D) model and; the d) Flat macular surface with Constant layer thickness 3 Dimensional (FC3D) model. In e) the model that is based solely on the LM transect is shown with lateral to the left and medial to the right. This is the first of the Quasi-2D models set. The macular perimeter that was used with the 3D models has now been removed to create the Quasi-2D models. Each of the variations within the Quasi-2D set either removes the curvature from the macular surface or averages the layer thickness of each of the layers. The remaining 2D models are the: f) Curved macular surface with Constant layer thickness 2 Dimensional (CC2D) model; g) Flat macular surface with Varying layer thickness 2 Dimensional (FV2D) model and; h) Flat macular surface with Constant layer thickness 2 Dimensional (FC2D) model. Figures 7e through 7f also represent the lateral-medial transects of their 3D counterparts: Figures 7a through 7d, respectively.