JAtlasView. A: JAtlasView showing an interactive 3D model of the muscles, tendons and bones of the embryonic mouse forelimb at E14.5. B: Anatomy key. Shows the name of each structure in the 3D model, its ontogeny and colour code. Structures can be switched off/on in the viewer window by clicking on the '+/-' icon in the Anatomy Key. C: Anatomy Tree. Shows the ontogeny of structures. Names can be clicked so structures appear in the 3D model.