Organization of cat anterior parietal cortex: relations among cytoarchitecture, single neuron functional properties, and interhemispheric connectivity.

McKenna, Thomas M.; Whitsel, B L; Dreyer, D. A.; Metz, Charles B.

doi:10.1152/jn.1981.45.4.667

Cited by 97 publications

(31 citation statements)

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“…This type of organization may be necessary to maintain the integrity of sensory discrimination derived from inputs from specialized body parts. A number of investigators have reported that regions of cortex in which receptive fields for neurons are small tend to be free of interhemispheric connections (e.g., McKenna et al, 1981;Herron and Johnson, 1987). Our data in the flying fox support the idea that these regions in cortex are usually associated with a peripheral specialization.…”

Section: Callosal Connections Morphological Specialization and Devesupporting

confidence: 82%

“…Without exception, connections are observed between the primary somatosensory areas, and the density of these connections depends on the body part representation examined. In mammals such as raccoons (Ebner and Myers, 1965;Herron and Johnson, 1987), cats (Ebner and Myers, 1965;Shanks et al, 1975;Caminiti et al, 1979;McKenna et al, 1981), rats (Wise and Jones, 1976;Akers and Killackey, 1978;Olavarria et al, 1984;Koralek et al, 1990), mice (White and DeAmicis, 1977), squirrels (Gould and Kaas, 1981;Krubitzer et al, 1986), tree shrews (Cusick et al, 1985;Weller et al, 1987), and primates (Pandya and Vignolo, 1968;Jones and Powell, 1969;Karol and Pandya, 1971;Jones et al, 1975;Jones and Hendry, 1980;Killackey et al, 1983;Shanks et al, 1985;Conti et al, 1986;Krubitzer and Kaas, 1990;Beck and Kaas, 1994), only representations of proximal body parts within SI Fig. 8.…”

Section: Interhemispheric Connections Of Somatosensory Fields In Mammalsmentioning

confidence: 99%

“…Callosal connections of area 3a in the flying fox varied with respect to the body part representation injected: The snout representation in area 3a was interconnected only with the snout representation in area 3a in the opposite hemisphere, whereas the distal forelimb representation of area 3a received more broadly distributed, topographically matched and mismatched projections from areas 3a, 3b, and 4 of the opposite hemisphere. Studies in which the total pattern of callosal connections of anterior parietal cortex were examined indicate that in monkeys (Jones and Powell, 1969;Karol and Pandya, 1971;Jones et al, 1975;Jones and Hendry, 1980;Killackey et al, 1983;Shanks et al, 1985) and cats (Shanks et al, 1975;McKenna et al, 1981), area 3a receives projections from the opposite hemisphere, and that the density of input to different body part representations, to a large extent, reflects that of area 3b. Thus, in cats and monkeys, the paw/hand representation in area 3a had sparse or no connections with the opposite hemisphere.…”

Section: Interhemispheric Connections Of Somatosensory Fields In Mammalsmentioning

confidence: 99%

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Interhemispheric connections of somatosensory cortex in the flying fox

et al. 1998

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Section: Callosal Connections Morphological Specialization and Devesupporting

confidence: 82%

Section: Interhemispheric Connections Of Somatosensory Fields In Mammalsmentioning

confidence: 99%

Section: Interhemispheric Connections Of Somatosensory Fields In Mammalsmentioning

confidence: 99%

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Interhemispheric connections of somatosensory cortex in the flying fox

et al. 1998

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“…Cats AS-CC 1-3 were premedicated with Decadron (1.3 mg/kg i.m.1 to prevent brain edema, deeply anesthetized with ketamine HC1 (30 mg/kg i.rn.1, and placed in a stereotaxic apparatus. The skull and dura overlying the left coronal gyrus (CG) were surgically removed to gain access to the forepaw zone of SI (McKenna et al, 1981;Felleman et al, 1983;Manzoni et al, 1990). PHA-L (Vector Labs; 2.5% in phosphate buffer at pH 7.4, 0.05 M) was ejected iontophoretically through a glass micropipette (20-30 pm in outer diameter) positioned by means of a micromanipulator and under stereomicroscopic magnification to a depth of about 0.8-1 mm into the cortex.…”

Section: Tracer Injections and Cortical Ablationmentioning

confidence: 99%

Topographical relations between ipsilateral cortical afferents and callosal neurons in the second somatic sensory area of cats

Barbaresi

Minelli

Manzoni

1994

J of Comparative Neurology

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Experiments were carried out on the second somatic sensory area (SII) of cats to study 1) the laminar distribution of axon terminals from the ipsilateral first somatic sensory cortex (SI); and 2) the topographical relations between their terminal field and the callosal neurons projecting to the contralateral homotopic cortex. To label simultaneously in SII both ipsilateral cortical afferents and callosal cells, cats were given iontophoretic injections of Phaseolus vulgaris-leucoagglutinin (PHA-L) in the forepaw zone of ipsilateral SI, and pressure injections of horseradish peroxidase (HRP) in the same zone of contralateral SII. The possibility that ipsilateral cortical axon terminals synapse callosal neurons was investigated with the electron microscope by combining lesion-induced degeneration with retrograde HRP labelling. Fibers and terminations immunolabelled with PHA-L from ipsilateral SI were distributed in SII in a typical patchy pattern and were mostly concentrated in supragranular layers. Labelled fibers formed a very dense plexus in layer III and ramified densely also in layers I and II. Labelled axon terminals were both en passant and single-stalked boutons. Counts of 8,303 PHA-L-labelled terminals of either type showed that 82.40% were in supragranular layers. The highest concentration was in layer III (43.99%), followed by layers II (30.32%) and I (8.09%). The remaining terminals were distributed among layers IV (6.96%), V (4.93%), and VI (5.68%). The same region of SII containing anterogradely labelled axons and terminals also contained numerous neurons retrogradely labelled with HRP from contralateral SII. Callosal projection neurons were pyramidal, dwelt mainly in layer III, and were distributed tangentially in periodic patches. Patches of anterograde and retrograde labelling either interdigitated or overlapped both areally and laminarly. In the zones of overlap, numerous PHA-L-labelled axon terminals were seen in close apposition to HRP-labelled pyramidal cell dendrites. Combined HRP-electron microscopic degeneration experiments showed that in SII axon terminals from ipsilateral SI form asymmetric synapses with HRP-labelled dendrites and dendritic spines pertaining to callosal projection neurons. These results are discussed in relation to the layering and function of the SI to SII projection, and to the evidence that SII neurons projecting to the homotopic area of the contralateral hemisphere have direct access to the sensory information transmitted from ipsilateral SI.

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“…Another open question is whether afferent information from joints activates the region that Hassler and Muhs-Clement (1964) named area 2. In primates, one of the identifying characteristics of area 2 is that it receives information from joints (Powell and Mountcastle, 1959;Pons and Kaas, 1985) as well as from skin (Hyvarenin and Poranen, 1978;McKenna et al, 1981;Iwamura et al, 1985;Ageranioti-BBlanger and Chapman, 1992).…”

mentioning

confidence: 99%

Cytoarchitecture and responsiveness of the medial ansate region of the cat primary somatosensory cortex

Myasnikov

Dykes

Avendaño

1994

J of Comparative Neurology

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To understand its relationship to somatosensory areas in other species, we studied the rostral bank of the medial ansate sulcus in adult cats. Neurons in the shoulder and upper part of the sulcal wall responded to low-threshold cutaneous stimuli much like neurons on the crown of the gyrus, whereas neurons in some deeper portions of the sulcus required more intense but innocuous somatic stimuli. Because we found much of the body surface re-represented in this area, we suggest that, besides the representation in area 3b, there is another cutaneous representation of the hindlimb and trunk located on the gyral crown near the medial end of the medial ansate sulcus and of the forelimb and trunk within the medial ansate sulcus. Posterior to this second cutaneous representation, many parts of the body were also represented in regions activated by more intense stimuli and having a different cytoarchitecture, suggesting that they were part of another body representation. Area 3b and the shoulder of the gyrus were distinguished by relatively intense acetylcholinesterase staining of layers III and IV. In the wall of the sulcus, all layers except layer I were uniformly stained to a point where electrophysiological recordings showed the cortex to be unresponsive, whereupon the outer two-thirds of layer I became very pale. Neurons activated by afferents from knee joints were found only in a small area; we did not find a mediolateral band serving joint afferents as is reported in primates. These data suggest that cat somatosensory cortex differs in some ways from primates but that it contains multiple representations of the body, as do most other mammals.

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Organization of cat anterior parietal cortex: relations among cytoarchitecture, single neuron functional properties, and interhemispheric connectivity.

Cited by 97 publications

References 0 publications

Interhemispheric connections of somatosensory cortex in the flying fox

Interhemispheric connections of somatosensory cortex in the flying fox

Topographical relations between ipsilateral cortical afferents and callosal neurons in the second somatic sensory area of cats

Cytoarchitecture and responsiveness of the medial ansate region of the cat primary somatosensory cortex

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