Sequential development of connections between striate and extrastriate visual cortical areas in the rat

Coogan, Thomas A.; Burkhalter, Andreas

doi:10.1002/cne.902780207

Cited by 33 publications

(17 citation statements)

References 58 publications

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“…However, labeling in sublayer VIb has been previously observed (see Divac et a]., 1987aDivac et a]., , 1987bFonseca et al, 1988;Reep and Goodwin, 1988). Moreover, injections of retrograde tracers into the lateral agranular fields of the motor cortex (Donoghue and Parham, 1983) and primary visual cortex (Miller and Vogt, 1984;Coogan and Burkhalter, 1988) also labeled cells in sublayer VIb. In a recent study using a combination of HRP, WGA:HRP, and fluorescent dyes, Koralek et al (1990) did not observe extensive labeling of sublayer VIb in the rat SI.…”

Section: Discussionmentioning

confidence: 78%

Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

Nicolelis

Chapin

Lin

1991

Somatosensory & Motor Research

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Rhodamine-coated microspheres (RCMs) were injected into the primary somatosensory cortex (SI) of rats ranging in age from postnatal (PN) day 1 to adulthood. Ipsilateral corticocortical and callosal projections within the SI were identified as early as PN day 1. At the end of the first PN week, ipsilaterally projecting neurons located in sublayer VIb were the first to assume an adult-like pattern of connectivity. Injections at subsequent postnatal ages revealed that an adult pattern of lamination of ipsilateral corticocortical projections within the SI is established between PN weeks 2 and 3, comprising projection neurons from layers II/III, layer V, and sublayer VIb. Therefore, local interactions in the rat SI are mediated not only by pyramidal neurons of layers III and V, derived from the cortical plate, but also by a subpopulation of ontogenetically older neurons located in the sublayer VIb, which may correspond to the subplate neurons of other species. Overall, these results suggest the existence of three independent short-range corticocortical systems of projections within the rat SI, which differ in terms of the laminar distribution and ontogenetic origin of their cells.

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Section: Discussionmentioning

confidence: 78%

Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

Nicolelis

Chapin

Lin

1991

Somatosensory & Motor Research

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“…Coogan and Burkhalter (1988) demonstrated that such corticocortical connections form in an inside-out pattern, with the infragranular layers of striate cortex reaching their extrastriate targets 4 FIG. 4.…”

Section: Timing Of Collateral Outgrowthmentioning

confidence: 99%

Specificity in the Development of Vertical Connections in Cat Striate Cortex

Katz

1991

Eur J of Neuroscience

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The main efferent axons of pyramidal cells in layer 2/3 in the adult cat striate cortex make collateral connections specifically within layer 2/3 and layer 5 and avoid the intervening layer 4. Intracellular dye injections in vitro were used to determine how, during early postnatal development, this precise pattern of laminar connections was achieved. These investigations revealed that the pattern of collateral outgrowth was specific from the very earliest time that axons began sprouting collaterals. During the first postnatal week, sprouts were seen exclusively within layers 2/3 and 5; no evidence for a transient connection to layer 4 was observed. Furthermore, collaterals emerged simultaneously within layers 2/3 and 5, despite the large difference in the postmigratory ages of the two layers. By the end of the second postnatal week, the adult number of collaterals was achieved. Further elaboration of the local arbors occurred by repeated branching of already existing collaterals, rather than by addition of new collaterals to the main axon. These results demonstrate that the formation of local connections between cortical layers is highly specific, in contrast to the development of clustered horizontal connections by these same cells within layers 2/3 and 5, which involves extensive remodelling of local connections.

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“…In fact, rodent feedforward connections resemble more closely the lateral connections in monkey (Felleman and Van Essen 1991). A likely reason for this difference is that feedforward connections in rodents originate from layers 2-6 (Coogan and Burkhalter 1988), whereas, in monkey, layers 2 and 3 are the main sources of these connections (Felleman and Van Essen 1991). From a developmental perspective, Dehay and Kennedy (2007) have argued that layers 2 and 3 in primates are different from layers 2 and 3 in mice, which lack the computational components of primate cortex.…”

Section: Cortical Hierarchymentioning

confidence: 99%

The Network for Intracortical Communication in Mouse Visual Cortex

Burkhalter¹

2016

Micro-, Meso- And Macro-Connectomics of the Brain

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New techniques for identifying cell types, tracing their synaptic partners, imaging and manipulating their activity in behaving organisms have made mice a widely used model for linking brain circuits to behavior. Most behaviors are tied to vision: identifying objects, guiding movements of body parts, navigating through the environment, and even social interactions. Reason enough to focus on the mouse visual cortex. To find our way around in the occipital cortex, we needed a map. We took a classic approach and traced in the same animal the outputs from multiple retinotopic sites of primary visual cortex (V1) and compared the relative location of projections in the extrastriate cortex. We found nine extrastriate maps and showed by single unit recordings that each of the connectional maps contained visually responsive neurons whose receptive fields were mapped in orderly fashion and completely covered the visual field. Remarkably, a tiny region of one sixth of a dime contained a two-to three-times larger number of areas than the highly developed somatosensory and auditory cortices. By tracing the connections, we found that each of the ten visual areas projected to 25-35 cortical targets and interconnected virtually all of the areas reciprocally with one another. Although the binary graph density of the connection matrix was nearly complete, the connection strengths between areas within the ventral and dorsal cortex differed, indicating that the information from V1 flowed into distinct but interconnected streams. Unit recordings and calcium imaging studies showed that the ventral and dorsal streams processed different spatiotemporal information, which aligned with known properties of streams in primates. Analyses of the laminar patterns of interareal projections showed that areas were organized at multiple levels, suggesting that each stream represented a processing hierarchy.

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Sequential development of connections between striate and extrastriate visual cortical areas in the rat

Cited by 33 publications

References 58 publications

Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

Specificity in the Development of Vertical Connections in Cat Striate Cortex

The Network for Intracortical Communication in Mouse Visual Cortex

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