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Journal of Experimental Biology, Vol 202, Issue 10 1291-1300, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
J Meek, K Grant and C Bell
Department of Anatomy, University of Nijmegen, PO Box 9101, The Netherlands, Institute Alfred Fessard, CNRS, Gif sur Yvette, France and Neurological Science Institute of Oregon Health Science University, Portland, OR 97209, USA. J.Meek@An.
The electrosensory lateral line lobe (ELL) of mormyrid teleosts is the first central stage in electrosensory input processing. It is a well-developed structure with six main layers, located in the roof of the rhombencephalon. Its main layers are, from superficial to deep, the molecular, ganglionic, plexiform, granular, intermediate and deep fiber layers. An important input arises from electroreceptors, but corollary electromotor command signals and proprioceptive, mechanosensory lateral line and descending electrosensory feedback inputs reach the ELL as well. The ELL input is processed by at least 14 cell types, which frequently show plastic responses to different inputs. The large ganglionic and large fusiform cells are the ELL projection cells. They are glutamatergic and project to the isthmic preeminential nucleus and the midbrain lateral toral nucleus. Interneurons are located in all ELL layers and are mostly GABAergic. The most remarkable interneurons are large multipolar cells in the intermediate layer, which have myelinated dendrites making presynaptic terminals contacting granular cells. With respect to the synaptic organization and microcircuitry of the ELL, a number of qualitative and quantitative aspects have been elucidated using electron microscopical and intracellular labeling techniques. However, the pathways by which primary afferent input influences the ELL projection cells are still undetermined: primary afferents do not seem to contact large fusiform or large ganglionic cells directly, but seem to terminate exclusively on granular cells, the axonal properties of which are not known. Consequently, more information of the structural organization of the ELL is still necessary for a detailed understanding of the neural basis of the plastic electrosensory input processing in mormyrids.
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 E. H. van den Burg, J. Engelmann, J. Bacelo, L. Gomez, and K. Grant Etomidate Reduces Initiation of Backpropagating Dendritic Action Potentials: Implications for Sensory Processing and Synaptic Plasticity During Anesthesia J Neurophysiol, March 1, 2007; 97(3): 2373 - 2384. [Abstract] [Full Text] [PDF]
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N. B. Sawtell, C. Mohr, and C. C. Bell Recurrent Feedback in the Mormyrid Electrosensory System: Cells of the Preeminential and Lateral Toral Nuclei J Neurophysiol, April 1, 2005; 93(4): 2090 - 2103. [Abstract] [Full Text] [PDF]
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C. Mohr, P. D. Roberts, and C. C. Bell The Mormyromast Region of the Mormyrid Electrosensory Lobe. I. Responses to Corollary Discharge and Electrosensory Stimuli J Neurophysiol, August 1, 2003; 90(2): 1193 - 1210. [Abstract] [Full Text] [PDF]
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V. Z. Han, K. Grant, and C. C. Bell Rapid Activation of GABAergic Interneurons and Possible Calcium Independent GABA Release in the Mormyrid Electrosensory Lobe J Neurophysiol, March 1, 2000; 83(3): 1592 - 1604. [Abstract] [Full Text] [PDF]
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