Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/73911
Title: Bilateral Thalamocortical Projection In Hedgehogs - Evolutionary Implications
Authors: Regidor García,José 
Divac, I
UNESCO Clasification: 249001 Neurofisiología
Keywords: Comparative Neuroanatomy
Brain Evolution
Insectivores
Atelerix-(Erinaceus) Algirus
Bilateral Thalamocortical Connections, et al
Issue Date: 1992
Journal: Brain, behavior and evolution 
Abstract: In adult hedgehogs with large unilateral cortical deposits of fluorescent somatopetal tracers, labelled perikarya were found not only in the ipsilateral but also contralateral thalamus. An exceptionally large number of contralaterally labelled neurons was seen in the ventrolateral nucleus, also at a considerable distance from the midline. Deposits of one of two different tracers in the fronto-parietal cortex of each hemisphere appear to label different perikarya in each ventrolateral nucleus. This projection to the contralateral cortex in hedgehogs does not resemble thalamo-cortical connections in either adult or developing brains of other mammalian species. Among amniotes, only in pigeons have contralateral projections from the thalamus to the telencephalon been described. The somatosensorimotor system of hedgehogs may be the only known mammalian remnant of primitive vertebrate thalamocortical organization. Whether primitive or derived, the bilateral thalamocortical projection in hedgehogs shows that hedgehog brains cannot be uncritically taken to represent brains of primate ancestors.
URI: http://hdl.handle.net/10553/73911
ISSN: 0006-8977
DOI: 10.1159/000114123
Source: Brain, behavior and evolution [ISSN 0006-8977], v. 39 (5), p. 265-269, (Mayo 1992)
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