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Horizontal cell axon terminals in growing goldfish.
1Department of Anatomy and Cell Biology, University of Michigan, Ann Arbor 48109-0616.
Experimental Eye Research
|December 1, 1990
Summary
Goldfish horizontal cell axon terminals grow much faster than the retina during development. This disproportionate growth may help fill space as retinal cell density decreases.
Area of Science:
- Neuroscience
- Retinal Biology
- Comparative Anatomy
Background:
- Cone horizontal cells in teleost fish retinas have axon terminals in the inner nuclear layer.
- These terminals form fusiform swellings and are implicated in cone-driven visual pathways.
Purpose of the Study:
- To investigate the growth patterns of horizontal cell axon terminals during postembryonic development in goldfish.
- To understand the relationship between axon terminal growth and retinal development.
Main Methods:
- Quantitative analysis of retinal and axon terminal volumes in goldfish of varying ages (juvenile to adult).
- Measurement of the relative volume increase of horizontal cell axon terminals compared to overall retinal growth over a 2-3 year period.
Main Results:
- Horizontal cell axon terminals exhibit disproportionate growth, increasing in relative volume nearly 20-fold.
- Retinal volume increases only approximately fourfold during the same 2-3 year period.
- Enlarging axon terminals compensate for the decreasing numerical density of nuclei in the inner nuclear layer.
Conclusions:
- Horizontal cell axon terminal growth significantly outpaces overall retinal growth in goldfish.
- This differential growth suggests a dynamic role for these terminals in retinal structure and function.
- Further studies comparing horizontal cell function in fish of different sizes are recommended to clarify their role in visual pathways.