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vol.22 número4ANÁLISIS MORFOMÉTRICO DE LOS AGUJEROS INFRAORBITALES Y SUPRANUMERARIOS EN CRÁNEOS DE INDIVIDUOS BRASILEÑOSRECONOCIMIENTO DE RESIDUOS DE N-ACETILGLUCOSAMINA (GLyNAc) Y POLI-N-ACETILLACTOSAMINA EN VASOS DE LA GLÁNDULA PINEAL DE RATAS índice de autoresíndice de materiabúsqueda de artículos
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International Journal of Morphology

versión On-line ISSN 0717-9502

Resumen

OLIVARES, R.; GODOY, G.; ADARO, L  y  ABOITIZ, F. Neuronal density in primary visual cortex (17 visual area), in two wild rodent species. Int. J. Morphol. [online]. 2004, vol.22, n.4, pp.279-284. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022004000400007.

Several studies show that environmental modifications (i.e. nutritional or sensory) can produce profound alterations in the normal development of the cerebral cortex and its connectivity. In addition, it is possible that in natural conditions animal species have developed neuronal adaptations to the different conditions of luminance in which they normally behave. In this work we studied the 17 visual area (primary visual cortex), of two sympatric Chilean rodents, a continuous activity period species (Abrothrix olivaceus, n=7) and a nocturnal species (Phyllotis darwini, n=7), in order to detect species differences in neuronal density in celloidin-embedded, 40 mm-thickness Nissl sections, with the aid of the optical disector. A. olivaceus showed a decreased neuronal density in relation to P. darwini (34.75x104+1.35x104 neurons/mm3 against 37.23x104+2.2x104 neurons/mm3), which was statistically significant (t=2.54;p<0.05). These differences might be related to differences in daily activity in the two species

Palabras clave : Cerebral cortex; Visual cortex; Neuronal density; P. darwini; A. olivaceus.

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