In the course of studies on the development of the optic tectum in the frog (Kollros, '53), considerable variation in the cell populations of the outermost tectal layers was noted, with some involvement of the deeper layers as well. The greatest differences appeared toward the end of metamorphosis, with cell counts in some animals being 30 to 40 per cent less than those in others. The animals with low counts were generally smaller than those with the high counts, and frequently they grew more slowly. In order to study the variations in tectal development which might be associated with variations in growth rate, the growth of tadpoles was inhibited through partial starvation and by crowding (see Rugh, '34), and the cell counts of the tecta of these animals were compared with those of well fed, uncrowded control animals.
Proceedings of the Iowa Academy of Science
©1955 Iowa Academy of Science, Inc.
Kollros, Jerry J. and Barch, Stephanie Henoch
"The Influence of Growth Rate Upon Brain development in Rana Pipiens Tadpoles.,"
Proceedings of the Iowa Academy of Science, 62(1), 189-492.
Available at: https://scholarworks.uni.edu/pias/vol62/iss1/61