Are the peripheric cells of macula to produce its increase?

After the birth, in the inferior Vertebrates the inner ear increase continuously and progressively. How happens such increase? Our studies have performed on the inner ear of Rana esculenta by immunofluorescence techniques and by SEM observations. In order to determine the new sensory cells’ derivation, we have given a mitogenic marker, the BrdU, to label cells that were in the process of dividing. We have evidenced that the sensory cells, with morphologic characteristics of young cells, are present in all three of maculae mostly to the periphery of the sensory epithelium. The young cells are rare between the mature sensory cells of central part of the maculae. For these data we can assume that the increase of the sensory areas happens from the periphery to the middle of the maculae by forming the new sensory and supporting cells. These cells, probably, have been originated by the division of support cells, subsequently they differ in sensory cells.