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Document Type

Research

Abstract

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.

Publication Date

1955

Journal Title

Proceedings of the Iowa Academy of Science

Volume

62

Issue

1

First Page

189

Last Page

492

Copyright

© Copyright 1955 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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