Patchy and laminar terminations of medial geniculate axons in monkey auditory cortex

  title={Patchy and laminar terminations of medial geniculate axons in monkey auditory cortex},
  author={Tsutomu Hashikawa and Marco Molinari and Estrella Rausell and E. G. Jones},
  journal={Journal of Comparative Neurology},
The object of this study was to identify the terminal distributions of thalamocortical axons arising in chemically characterized subdivisions of the medial geriiculate complex. Large injections of wheat germ agglutinin‐conjugated horseradish peroxidase or small injections of Phaseolus vulgaris leucoagglutinin were made in the medial geniculate complex of Macaca fuscata. The terminal distributions of labeled axons in the cortex were correlated with auditory cortical fields demonstrable by… 

Auditory thalamocortical pathways defined in monkeys by calcium‐binding protein immunoreactivity

This study investigated differentiation of Macaca fuscata auditory thalamus into chemically defined nuclei forming relays to auditory cortical areas. The thalamus was stained immunocytochemically for

Callosal connections of the ferret primary auditory cortex

The discrete nature of the callosal bands in the ferret appears to make it a suitable species for studying the relationship between callosal terminals and those arising in other areas of the brain and for clarifying the possible existence of separate functional systems within the auditory cortex.

Parvalbumin is expressed in a reciprocal circuit linking the medial geniculate body and auditory neocortex in the rabbit

Double‐labeling experiments in adult rabbits provide evidence for the existence of multiple, chemically coded pathways linking primary auditory cortex and the MGV.

Functional Subregions in Primary Auditory Cortex Defined by Thalamocortical Terminal Arbors: An Electrophysiological and Anterograde Labeling Study

A model is presented showing how patchy thalamocortical projections participate in the formation of tonotopic and binaural maps in primary auditory cortex.

Distinctive Spatial and Laminar Organization of Single Axons from Lateral Pulvinar in the Macaque

Finer, single axon analysis, as reviewed here for projections from the lateral pulvinar in two macaque monkeys, demonstrates that PL axons have multiple arbors in V2 and V4, and that these are spatially separate and offset in different layers.

Auditory thalamocortical projections in the cat: Laminar and areal patterns of input

The results suggest that the subdivisions of the auditory thalamus have consistent patterns of laminar distribution to different cortical areas, that an average of five or more layers receive significant input in a specific area, and that a given thalamic nucleus can influence areas as far as 20 mm apart.

Thalamocortical connections of the parabelt auditory cortex in macaque monkeys

The thalamocortical connections of the parabelt auditory cortex are described based on multiple injections of neuronal tracers into this region in each of five macaque monkeys, suggesting that this region represents a third level of auditory cortical processing, which is not influenced by direct inputs from primary cortical or subcortical auditory structures.

Connections of the dorsal zone of cat auditory cortex

The anatomic connections of the dorsal zone of cat auditory cortex are examined to suggest that the DZ is a potentially separate auditory field from AI and is likely to be involved in both temporal and spectral integration of acoustic information.

Projections of auditory cortex to the medial geniculate body of the cat

The corticofugal projection from 12 auditory cortical fields onto the medial geniculate body was investigated in adult cats by using wheat germ agglutinin conjugated to horseradish peroxidase or biotinylated dextran amines, suggesting that every auditory thalamic nucleus is under some degree of descending control.



Areal differences in the laminar distribution of thalamic afferents in cortical fields of the insular, parietal and temporal regions of primates

A cytoarchitectonic parcellation has been made of the cortex of the insula and of the adjoining parts of the temporal and parietal lobes in rhesus and squirrel monkeys. In conjunction with this, the

Laminar Termination Patterns of Thalamic, Callosal, and Association Afferents in the Primary Auditory Area of the Rhesus Monkey

Thalamic, callosal, and association afferents to the primary auditory konicortex, area KA, were investigated in rhesus monkeys with the aid of anterograde tract tracing techniques and it seems that thalamic and callosal inputs to KA are organized in a largely complementary fashion.

Commissural and cortico-cortical "columns" in the somatic sensory cortex of primates

Anatomical experiments demonstrate that commissural and cortico-cortical fibers arising and terminating in the somatic sensor- cortex of monkeys terminate in layers I through IV in a mosaic of

Connections of the primary auditory cortex in the common marmoset, Callithrix jacchus jacchus

The afferent and efferent connections of the primary auditory cortex (AI) of common marmosets were traced following small injections of wheat germ agglutinin conjugated with horseradish peroxidase

Subdivisions of the auditory cortex of the cat: The retrograde transport of horseradish peroxidase to the medial geniculate body and posterior thalamic nuclei

Each subdivision of auditory cortex was injected with horseradish peroxidase with the result that in some cases the diffusion of HRP was restricted while in other cases, HRP diffused over an entire cortical subdivision and encroached on adjacent subdivisions.

The thalamocortical and corticothalamic conections of AI, AII, and the anteriior auditory field (AFF) in the cat: Evidence ofr two largely sergregarted systems of connections

The thalamocortical and corticothalamic connections of the three cortical auditory fields—first (AI), second (AII), and anterior (AAF)—were defined using anterograde and retrograde tracing techniques to determine the systematic topographies of the connections between these cortical fields and the medial geniculate body subdivisions.

Terminal arbors of axons projecting to the somatosensory cortex of the adult rat. I. The normal morphology of specific thalamocortical afferents

  • KF JensenH. Killackey
  • Biology
    The Journal of neuroscience : the official journal of the Society for Neuroscience
  • 1987
The morphology, size, and distribution of these terminal arbors support the hypothesis that the layer IV plexus of a single specific thalamocortical afferent tends to fill a vibrissae-related cluster within the somatotopic map of the rodent neocortex.