The prefrontal corticotectal projection in the cat

Segal, Richard; Beckstead, Robert M.; Kersey, Kathryn S.; Edwards, Stephen B.

doi:10.1007/bf00237879

Cited by 43 publications

(14 citation statements)

References 31 publications

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“…The almost exclusively ipsilateral labelling observed in the superior colliculus agrees well with the results obtained in the rat by Newman et al (1989) and with the study by Harting et al (1992) of the corticotectal pathway in the cat (see also Tortelly et al, 1980). Similar to the findings in our study, injections into areas 6a␤ and 6a␥ resulted in dense labelling in the intermediate layers of the SC (see also Segal et al, 1983;Illing and Graybiel, 1985). Harting et al (1992) also described a weak projection from the forelimb representation of area 4 in the cat that was not observed in our study, but that was also reported by Newman et al (1989).…”

Section: Pontine Nucleisupporting

confidence: 92%

Organization of the projections from the pericruciate cortex to the pontomedullary brainstem of the cat: A study using the anterograde tracerPhaseolus vulgaris-leucoagglutinin

1997

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The anterograde tracer Phaseolus vulgaris-leucoagglutinin (PHA-L) was used to study the distribution and density of the projections that originate from four identified subdivisions of the pericruciate cortex (namely, the forelimb and hind limb representations of area 4, area 6a beta, and area 6a gamma) and that terminate in the pontomedullary brainstem in the cat. Injections of PHA-L in all areas of the pericruciate cortex labelled numerous fibers and their terminal swellings in the brainstem. The major target regions of all four cortical areas were the pontine nuclei and the pontomedullary reticular formation (PMRF). Injections into both the forelimb and hind limb representations of area 4 and into area 6a beta resulted in a dense pattern of terminal labelling in restricted regions of the medial and lateral parts of the ipsilateral pontine nuclei. The labelling following the area 6a beta injection was spatially distinct from that seen following the area 4 injections. Injections into the forelimb representation of area 4 as well as into area 6a beta and 6a gamma resulted in the labelling of numerous terminal swellings bilaterally in the PMRF; in contrast, there were few labelled terminal swellings in the PMRF following injections into the hind limb representation of area 4. Terminal swellings on individual corticoreticular fibers were far less densely aggregated than those in the pontine nuclei. The dense pattern of innervation to restricted regions of the pontine nuclei supports previous suggestions that the corticopontine projections retain a high degree of topographical specificity that could be used in the control of discrete voluntary movements. In contrast, the more diffuse pattern of the projections to the PMRF may facilitate the selection and activation of the complex postural patterns that accompany voluntary movement.

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Section: Pontine Nucleisupporting

confidence: 92%

Organization of the projections from the pericruciate cortex to the pontomedullary brainstem of the cat: A study using the anterograde tracerPhaseolus vulgaris-leucoagglutinin

1997

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“…Corticotectal projection of the FOA has been shown in the cat (SPRAGUE, 1963;KAWAMURA and KONNO, 1979;KONNO, 1979;TORTELLY et al, 1980;SEGAL et al, 1983). The fiber connection between the fundus of the coronal sulcus and the SC, a subcortical structure related to eye movement, was shown by HARTWICH-YOUNG and WEBER (1986), in agreement with our anatomical and electrophysiological results.…”

Section: Hrp-iahcled Cells In the Co Rnsupporting

confidence: 87%

Monocular eye movement in the cat: Its corticotectal pathway.

Tamai¹,

Nakai²,

Miyashita³

1988

Jpn.J.Physiol

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Summary The corticotectal pathway from the fundus of the cat's coronal sulcus (CORo) from which monocular movements of contralateral eye were evoked was studied using electrophysiological and anatomical techniques. Neurons in the CORo were activated antidromically by electrical stimulation of the deep layer of the superior colliculus (SC). Labeled cells were found in the CORo following horseradish peroxidase injection in the SC.

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“…This observation was later confirmed by retrograde labeling of different classes of efferent collicular neurons (Castiglioni et al, 1978;Huerta et al, 1981;Murray and Coulter, 1982;Yamasaki et al, 1986). In parallel, there is a patchy innervation of most, if not all, of the collicular afferents (from cortex, Goldman and Nauta, 1976;Kü nzle and Akert, 1977;Leichnetz et al, 1981;Segal et al, 1983;Clemo and Stein, 1983; from subcortical sensory relays, Kudo and Niimi, 1980;Tashiro et al, 1980;Huerta et al, 1981;Kudo, 1981;Huerta and Harting, 1982;Harting and Van Lieshout, 1991; from basal ganglia, Jayaraman et al, 1977;Graybiel, 1978a;Beckstead et al, 1979;Harting and Van Lieshout, 1991;Redgrave et al, 1992; from cerebellum, Kawamura et al, 1982; from hypothalamus, Rieck et al, 1986). Patches in the intermediate layers are regularly described in the frontal plane as a series of groups of either terminals or neurons with generally increased size from medial to lateral SC.…”

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confidence: 67%