By M. Constantine-Paton, J. J. Norden (auth.), S. Robert Hilfer, Joel B. Sheffield (eds.)
The eye has involved scientists from the earliest days of organic in vestigation. the range of its components and the precision in their interplay make it a favourite version approach for numerous developmental reviews. the attention is a very worthwhile experimental method not just simply because its tissues supply examples of basic approaches, but additionally since it is a trendy and simply obtainable constitution at very early embryonic a long time. which will supply an open discussion board for investigators engaged on all elements of ocular improvement, a chain of symposia on ocular and visible devel opment used to be initiated in 1973. an enormous aim of the symposia has been to foster verbal exchange among the elemental study employee and the medical group. it's our feeling that a lot should be realized on either side from this interplay. the assumption for a casual assembly permitting greatest ex swap of rules originated with Dr. Leon Candeub, who provided the nec essary motive force that made the sequence a fact. every one symposium has focused on a distinct element of ocular improvement. audio system were chosen to strategy similar themes from varied perspectives.
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Additional resources for Development of Order in the Visual System
Cells of the germinative zone are high cuboidal or low columnar epithelial cells (figure 1c). The lateral membranes of these cells unlike the central and pre-germinative cells, are not markedly infolded. , 1980). Cells of this region are high columnar with uniform, hexagonal cross-sectional profiles. They are arranged in ordered rows (figure 1d). The basal surface is loosely attached to the specialized basement membrane of the lens epithelium known as the lens capsule. Of the six lateral faces of transi tional zone cells, two are broad and four are narrow.
Thus, the demands for shifting are greatly reduced. However, the axons are still capable of dramatic rearrangements such as those induced by early eye rotation. This capacity for reorganization is demonstrated by the results of electrophysiological mapping of eyerotated froglets. Surprisingly, after ~-metamorphic eye rotation, 31 distances ab ac ad bc bd cd Figure 12: Mean interterminal distance is computed by measuring distances between all pairs of terminals and calculating the mean. the maps recorded in the first few weeks after metamorphosis are essentially normal; only at about 1-3 months post-metamorphosis do the ipsilateral maps shift orientation to reflect the new relationship between the two eyes (Grant and Keating, 1985).
Caminiti. 1980. Postnatal shaping of callosal connections from sensory areas. Exp. Brain Res. 38:381-394. M. O. Frost. 1979. Effects of visual experience on the maturation of the efferent system to the corpus callosum. Nature 280:231-233. J. 1974. The role of visual function in the patterning of binocular visual connections. British Medical Bulletin 30:145-151. J. and J. Feldman. 1975. Visual deprivation and intertectal neuronal connections in Xenopus laevis. Proc. R. Soc. Lond. B. 191:467-474.
Development of Order in the Visual System by M. Constantine-Paton, J. J. Norden (auth.), S. Robert Hilfer, Joel B. Sheffield (eds.)