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The Presynaptic Cell Determines the Number of Synapses in the Drosophila Optic Ganglia (1994)

Canal, I. ; Fariñas, I. ; Gho, M. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

European journal of neuroscience 6 (1994), S. 0

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ISSN: 1460-9568

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: The role of the pre- and postsynaptic cells in determining the number of synapses has been investigated in retina mosaics of the gigas (gig) mutant of Drosophila. Mutant photoreceptors are two to three times larger than those of the wild type, while adjacent cells in the mosaic retina and the lamina are normal in size. Serial electron microscope reconstructions of mosaic lamina cartridges show that gig photoreceptors establish more synapses upon lamina neurons than the normal photoreceptors do. By contrast, the number of feedback synapses that lamina neurons make onto gig photoreceptors does not increase. The increment in the number of synapses correlates positively with the increment of presynaptic cell membrane, resulting in constancy of synapse density. The phototactic response of flies bearing a gig eye is abnormal, indicating that the extra synapses are functional.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1460-9568.1994.tb01004.x

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Ultrastructure of putative migrating cells in the cerebral cortex of Lacerta galloti (1986)

Garcia-Verdugo, J. M. ; Farinas, I. ; Molowny, A. ; [et al.]

New York, NY : Wiley-Blackwell

Journal of Morphology 189 (1986), S. 189-197

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: Cells considered to be migratory in the cerebral cortex of adult lizards are ultrastructurally of two types. Nuclei in the first type have highly dispersed chromatin, creating a spongy appearance, whereas in the second type the chromatin is irregularly clumped. Both types of cells are closely associated with processes of radial ependymal glia cells, which perhaps orient their migratory pathways. Cells with spongy chromatin show an increase in cytoplasmic organelles and progressive chromatin condensation as they travel from the ependymal layer to the granular layer. Possibly these cells account for the neuronal increase that takes place in the granular layer during postnatal life. Cells with chromatin clumps are very scarce; ultrastructurally they resemble immature reptilian astroglia cells.

Additional Material: 8 Ill.