Abstract
The present study, based on neurohistological techniques (Nissl-staining, Golgi-impregnation), focuses on the cytoarchitecture of the corticoid complex in the strawberry finch, Estrilda amandava. This complex in birds occupies the dorsolateral surface of the telencephalic pallium and remains subdivided into an intermediate corticoid area (CI) and a dorsolateral corticoid area (CDL). The CDL in the strawberry finch is a thin superficial part of the caudal pallium adjoining the medially situated hippocampal formation, whereas the CI is demarcated between the CDL and the parahippocampal area of telencephalon. Neurons of the corticoid complex are classified into three main cell groups: predominant projection neurons, local circuit neurons and stellate neurons. The spinous projection neurons send out distant projecting axons that typically extend several varicose collaterals. Most of these collaterals lie parallel to the ventricle. These neurons are subclassified into pyramidal neurons (localized only in the CI) and multipolar neurons (present in both the CI and CDL). The CDL also possesses small and medium-sized horizontal cells, which are bitufted or multipolar with smooth, moderately branching dendrites. The aspinous local circuit neurons extend short axons that ramify locally. Stellate neurons have sparse spinous dendrites and locally arborizing axons. The corticoid complex of birds corresponds to the lateral cerebral cortex of lizards and to the entorhinal cortex of mammals on the basis of neuronal morphology and bidirectional connections between adjacent areas.
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The authors thank the Head of the Department of Zoology, University of Allahabad, Allahabad for providing essential facilities for the present investigation.
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This work is supported by a D. Phil. Fellowship under the UGC scheme awarded to P. Chand and by a CSIR Fellowship (F. no. 9/1 (270)/2004 — EMR-І) awarded to R.C. Maurya.
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Srivastava, U.C., Chand, P. & Maurya, R.C. Neuronal classes in the corticoid complex of the telencephalon of the strawberry finch, Estrilda amandava . Cell Tissue Res 336, 393–409 (2009). https://doi.org/10.1007/s00441-009-0790-1
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DOI: https://doi.org/10.1007/s00441-009-0790-1