Tectal neurons that participate in centrifugal control of the quail retina: a morphological study by means of retrograde labeling with biocytin

Visual Neuroscience
Hiroyuki UchiyamaH Ito

Abstract

An avian retinopetal nucleus, the isthmo-optic nucleus (ION), is known to receive predominant inputs from the ipsilateral optic tectum. We injected biocytin into the ION in the Japanese quail, and retrogradely labeled tectal neurons projecting to the isthmo-optic (IO) neurons, or the tecto-IO neurons, with an extraordinary Golgi-like quality. Somata of the tecto-IO neurons were located in layer 9 of the tectum. The tecto-IO neurons did not have apical dendrites extending into superficial retino-recipient layers (layers 2-7), but had descending dendrites ramified in layers 9-12. They also possessed short ascending dendrites ramifying in the upper half of layer 9. This dendritic morphology suggests that main input to the tecto-IO neurons may not be of retinal origin. The tecto-IO neurons were spatially arranged in a regular pattern. Distances between neighboring tecto-IO neurons were 50-100 microns. The dendrites of each tecto-IO neuron were not widely dispersed in the horizontal plane, and were confined in a vertically oriented column of 100-200 microns diameter. They possessed axon collaterals extending horizontally in layers 12 and 13. The estimated total number of the tecto-IO neurons was approximately 7000-10,000, which is a...Continue Reading

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Citations

Jan 13, 2000·Trends in Neurosciences·J E Cook, L M Chalupa
Mar 10, 2000·Brain Research Bulletin·J HuS R Wang
Mar 20, 2009·Visual Neuroscience·Cynthia WellerMartin Wilson
Apr 29, 2011·Visual Neuroscience·Martin Wilson, Sarah H Lindstrom
Feb 3, 2009·Experimental Brain Research·Hiroshi Ohno, Hiroyuki Uchiyama
May 23, 2012·Behavioural Brain Research·Hiroyuki UchiyamaRyuki Kodama
Jul 20, 2016·The Journal of Comparative Neurology·Bertram NiederleitnerHarald Luksch
Mar 4, 2017·The Journal of Comparative Neurology·Quirin KrabichlerHarald Luksch
Jul 13, 2004·The Journal of Comparative Neurology·Hiroyuki UchiyamaHiroshi Ohno
Feb 14, 2006·Visual Neuroscience·H Uchiyama, W K Stell

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