3-D structure of double-layer bird papilla sensory epithelium consisting of sensory (A) and supporting (B) cells in ratio AB2. From left (I) - topological sceleton of cell`s sheet, next (II) - adjacency of cells on various levels (a-e), (III) - 3D cellular shape and interposition (there are no shown the nervous fibers here and next up to fig. 10); (IV) - series of mosaics a - e, demonstrate the contiguity of neighboring cells at appropriate levels of model. Right part (V) shows a pattern of cell connections at the corresponding levels of real sensory epithelium. Modified from Savostyanov 2012.

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