Neuronal Organization of Cat Motor Cortex

Oshima, Tomokazu

doi:10.1007/978-3-642-69931-3_27

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…A diffuse nature of phasic cortical arousal contrasts with a specific motor function brought about by VL inputs. Such different functions may appear in physiological conditions only separatly in time, as have been demonstrated in cortical arousal that develops from phasic to tonic phases (OSHIMA,1983(OSHIMA, , 1984 …”

Section: Discussionmentioning

confidence: 97%

Intracortical spread of neuronal activities induced by stimulation of recurrent and thalamic afferent pathways compared with epicortical activation.

Ezure

Oshima

1985

Jpn.J.Physiol

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1) In the encephale isole cat preparation the cerebral peduncle (CP) and the nucleus ventralis lateralis (VL) of the thalamus were stimulated. Short-latency responses recorded from precruciate cortical neurons consisted of excitatory (EPSP) and inhibitory postsynaptic potentials (IPSP). 2) Laminar distributions of these responses and their latencies were viewed as the spatiotemporal pattern of spread of excitation and inhibition within the cortex in comparison with those obtained by epicortical stimulation (EPICS). 3) In contrast with activities by EPICS spreading downwards from superficial to deep layers, CP recurrent activities spread upwards from deep to middle or superficial layers, and those by VL afferents spread from middle to both superficial and deep layers bidirectionally. 4) These three intracortical routes shared common cell assemblies in that they received convergent EPSPs or IPSPs to various extents from different inputs. The routes for EPICS and VL inputs were overlapped particularly with abundant supply of convergence in spite of their functional difference. Relevant potentiality of the cerebral network in forming plural patterns was discussed.

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Section: Discussionmentioning

confidence: 97%

Intracortical spread of neuronal activities induced by stimulation of recurrent and thalamic afferent pathways compared with epicortical activation.

Ezure

Oshima

1985

Jpn.J.Physiol

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“…Vertically directed transmissions from the superficial to deep layers have been postulated to play a leading role in initiating phasic EEG arousal (INUBUSHI et al, 1978a, b;EZURE and OSHIMA, 1981 c), whereas horizontal activity spread has not been examined during EEG arousal (EZURE and OSHIMA, 1981 c). These two modes of activity spread could be tested to determine whether the neuronal responses to EPICS are identical with those in the phasic arousal state (OSHIMA, 1984). The third paper (EZURE and OSHIMA, 1985b) will report the results of this comparative study.…”

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confidence: 99%

Vertical spread of neuronal activity within the cat motor cortex investigated with epicortical stimulation and intracellular recording.

1985

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1) In the encephale isole cat preparation the surface of precruciate cortex was electrically stimulated. Intracellular responses underneath the stimulated site were recorded to assess the vertical spread of activities across the cortical layers. 2) To the epicortical stimulation (EPICS) with intensity adjusted to evoke a pure negative wave in the direct cortical response (DCR), only some neurons in relatively superficial layers responded with excitatory postsynaptic potentials (EPSPs). 3) Stimuli intensified to evoke both the negative and subsequent positive waves in DCR produced in all tested cells either EPSPs, inhibitory postsynaptic potentials (IPSPs), or both. Direct or axonal antidromic excitation of the cell was observed only infrequently. 4) Cells with EPSPs distributed through all the layers with two peak populations in laminae II and V-VI. Those with IPSPs were located mainly in the upper half of lamina III with a few in more superficial as well as in deeper layers. Both EPSPs and IPSPs showed mono-or oligosynaptic latencies (0.6-10 msec) that tended to become longer in deep than in superficial layers. 5) Some deep layer cells including fast and slow pyramidal tract cells showed slowly rising monosynaptic EPSPs of dendritic origin. 6) Further late responses consisted of EPSPs, IPSPs, disfacilitation (DF), and disinhibition (DI). DF or DI occurred in some deep layer cells. 7) Two modes of vertical spread of activities were postulated : one the cascade transmissions which increased response repertoire toward the depths, and the other the electrotonic spread of EPSPs along dendrites.

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Neuronal Organization of Cat Motor Cortex

Cited by 2 publications

References 5 publications

Intracortical spread of neuronal activities induced by stimulation of recurrent and thalamic afferent pathways compared with epicortical activation.

Intracortical spread of neuronal activities induced by stimulation of recurrent and thalamic afferent pathways compared with epicortical activation.

Vertical spread of neuronal activity within the cat motor cortex investigated with epicortical stimulation and intracellular recording.

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