The second model of spatial organization of two-layered epithelia has got the composition of AB tetragonal cells. For arrangement and designations see Fig. 4. On the right side are shown:

• a) Apical surface of grass frog larva epidermis. A cellular shapes resembling regular squares can be seen as well as an intersections of four cellular edges. SEM;
• b) A semi-thin tangentional sections of the epidermis at the level close to middle. There is a group of small cells with four edges and large octagonal cell shapes, mutual arrangement of which is comparable with mosaic b;
• c) a group of cell profiles with four edges, mutual arrangement of which is comparable with mosaic c. From Savostyanov 2005, modified.

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