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• W2089140815 abstract "As a starting point for understanding the development of the cerebral cortex in reptiles and for determining how reptilian cortical development compares to that in other vertebrate classes, we studied the appearance and morphological differentiation of cerebral cortical neurons in embryonic turtles. 3H-thymidine birthdate labeling and focal injections of horseradish peroxidase (HRP) in in vitro cortical slices revealed that replicating cells occupy the outer ventricular zone, and subsequently migrate to the ventricular surface where they divide. Postmitotic neurons begin differentiating and elaborating neurites while migrating back through the ventricular zone. On their arrival at the top of the ventricular zone, pyramidal and nonpyramidal neurons can be distinguished morphologically. Cells with multipolar apical dendritic tufts ascending in the marginal zone resemble immature pyramidal neurons. Neurons morphologically similar to these early pyramidal cells were retrogradely labeled by injections of the lipophilic tracer 1,1-dioctadecyl-3,3,3′,3′-tetramethyl indocarbocyanine perchlorate (diI) in a known pyramidal cell target, the thalamus. Nonpyramidal neurons, resembling Cajal-Retzius cells, had horizontally oriented long axons and dendrites coursing in the plexiform primordium, the future marginal zone. With further development morphological differences between cell types became accentuated, and pyramidal cell somata were segregated into a single cellular layer flanked by zones containing predominantly nonpyramidal cell. Axon elaboration occurred early in embryonic development, as pyramidal cells sent axonal branches to the septum, thalamus, and cortical targets soon after their generation, and the intracortical axonal plexus became increasingly dense during embryonic life. Over a similar time course the distribution of projecting neurons labeled by thalamic diI injections changed from an initial homogeneous distribution to a preferential location in the superficial half of the cellular laye. Results from this study demonstrate several features of cortical differentiation that are conserved in reptiles and mammals, including similar early morphological differentiation events, the early distinction of principal cell types, and the parallel development of pyramidal and nonpyramidal neurons. The context in which these similar developmental events occur, however, differs profoundly in reptiles and mammals, with differences in the timing and location of neurite elaboration and differences in the appearance and architectonic organization of the cortex. Comparison of cortical developmental patterns between reptiles and mammals shows that similar functional cortical circuits with balanced excitation and inhibition can emerge in diverse cortical structures." @default.
• W2089140815 created "2016-06-24" @default.
• W2089140815 creator A5015724734 @default.
• W2089140815 creator A5027599386 @default.
• W2089140815 date "1991-08-22" @default.
• W2089140815 modified "2023-10-18" @default.
• W2089140815 title "Morphological differentiation of distinct neuronal classes in embryonic turtle cerebral cortex" @default.
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• W2089140815 doi "https://doi.org/10.1002/cne.903100405" @default.
• W2089140815 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1719040" @default.
• W2089140815 hasPublicationYear "1991" @default.
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