NDLI: The visual system of a palaeognathous bird: visual field, retinal topography and retino-central connections in the Chilean tinamou (Nothoprocta perdicaria).

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The visual system of a palaeognathous bird: visual field, retinal topography and retino-central connections in the Chilean tinamou (Nothoprocta perdicaria).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Krabichler, Quirin Vega-Zuniga, Tomas Morales, Cristian Luksch, Harald Marín, Gonzalo J.
Description	Country affiliation: Germany Author Affiliation: Krabichler Q ( Chair of Zoology, Technische Universität München, Freising-Weihenstephan, Germany.)
Abstract	Most systematic studies of the avian visual system have focused on Neognathous species, leaving virtually unexplored the Palaeognathae, comprised of the flightless ratites and the South American tinamous. We investigated the visual field, the retinal topography, and the pattern of retinal and centrifugal projections in the Chilean tinamou, a small Palaeognath of the family Tinamidae. The tinamou has a panoramic visual field with a small frontal binocular overlap of 20°. The retina possesses three distinct topographic specializations: a horizontal visual streak, a dorsotemporal area, and an area centralis with a shallow fovea. The maximum ganglion cell density is 61,900/ mm(2) , comparable to Falconiformes. This would provide a maximal visual acuity of 14.0 cycles/degree, in spite of relatively small eyes. The central retinal projections generally conform to the characteristic arrangement observed in Neognathae, with well-differentiated contralateral targets and very few ipsilateral fibers. The centrifugal visual system is composed of a considerable number of multipolar centrifugal neurons, resembling the 'ectopic' neurons described in Neognathae. They form a diffuse nuclear structure, which may correspond to the ancestral condition shared with other sauropsids. A notable feature is the presence of terminals in deep tectal layers 11-13. These fibers may represent either a novel retinotectal pathway or collateral branches from centrifugal neurons projecting to the retina. Both types of connections have been described in chicken embryos. Our results widen the basis for comparative studies of the vertebrate visual system, stressing the conserved character of the visual projections' pattern within the avian clade.
File Format	HTM / HTML
ISSN	00219967
Issue Number	2
Volume Number	523
e-ISSN	10969861
Journal	Journal of Comparative Neurology
Language	English
Publisher	Wiley
Publisher Date	2015-02-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Neurology Birds Anatomy & Histology Physiology Retina Visual Fields Animals Brain Cell Count Neuroanatomical Tract-tracing Techniques Retinal Neurons Cytology Visual Pathways Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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