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The aim of the present study was to identify in the rat the overall input-output pattern of connections of the primary auditory field, with special attention to the topographical organization of the geniculocortical auditory projection. By using cytoarchitectural criteria, three temporal cortical fields were distinguished in the rat: Te1, Te2, and Te3. The(More)
The present study in the rat deals with the hodological organization of two cytoarchitectonically distinct areas lying caudoventrally (Te2) or ventrally (Te3) to the primary auditory area (Te1). The afferent and efferent systems of connections were identified by using the properties of retrograde and anterograde transport of wheat germ agglutinin conjugated(More)
Lying just ventral to the medial geniculate nucleus and dorsal to the cerebral peduncle, the peripeduncular area (PPA) seems to be implicated in the expression of several sexual reflexes in rodents. The aim of the present investigation was to establish the organization of the afferent and efferent projections of the rat's PPA in an attempt to provide a(More)
The aim of the present study was to improve our knowledge of the synaptic organization of one major motor loop, the thalamo-fronto-striate system. We examined, within the motor and sensorimotor (Fr1-3, FL, HL) cortices, the organization of the synaptic articulation between thalamic terminals and fronto-striatal neurons. An anterograde tracer (Phaseolus(More)
Previous experiments have established that grafts of embryonic day (E) 16 frontal cortex placed into the occipital cortex of postnatal day (P) 0-P1 rats selectively attract axons from the ventrolateral and ventromedial (VL/VM) thalamic nuclei (Frappé et al., Exp. Neurol. 169 (2001) 264). The present study was therefore undertaken to identify any possible(More)
It has been proposed that the distribution of efferents developed by neocortical neurons depends upon where in the neocortex the cells develop, not where they were generated. However, the capacity of diverse isocortical areas to differentiate connectional characteristics belonging to other isocortical areas has recently been questioned in several(More)
Previous light microscopical studies have indicated that fibres from the ventrolateral thalamic nucleus (VL) establish direct axo-somatic and axo-dendritic presumed contacts with layers III and V neurones of the intact frontal cortex projecting to the striatum. Additional experiments provided evidence that this thalamo-fronto-striate pathway could be partly(More)
In the rat, the major output of the posterior thalamic nucleus (PT) ends in the ventrolateral sector of the rostral two-thirds of the red nucleus. The aim of this study is to identify the rubral cells contacted by these thalamic efferents. In a first set of experiments, an anterograde neurotracer (PHA-L) was injected into the rostral part of the red(More)
Previous observations in intact rats have indicated that axons from the ventrolateral thalamic nucleus (VL) establish direct axo-somatic or axo-dendritic contacts onto frontal cortical neurons projecting to the striatum. The embryonic frontal cortex was grafted into the damaged frontal cortex of newborn rats to study the capacity of homotopic transplants to(More)
The mechanisms underlying the differentiation of neocortical areas are still largely unknown. The development of neural connectivity constitutes one important step in neocortical differentiation. One way to study the mechanisms guiding this developmental stage is to examine the connections established by transplants of neocortical tissue of varying(More)