Investigation of the cortico-reticulo-spinal connections in cats
| Autor: | A.I. Pilyavsky, Gokin Ap |
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| Rok vydání: | 1978 |
| Předmět: | |
| Zdroj: | Neuroscience. 3:99-103 |
| ISSN: | 0306-4522 |
| DOI: | 10.1016/0306-4522(78)90159-8 |
| Popis: | Stimulation of the motor cortex evoked postsynaptic potentials in bulbar reticulo-spinal neurons of anaesthetized cats. In 72.4% of reticulo-spinal neurons they were identified as monosynaptic. According to the time characteristics they were classified into two groups (‘fast’ and ‘slow’). Corticobulbar fibres projecting to reticulospinal neurons could be also differentiated as ‘fast’ (conduction velocities above 20 m/s) and ‘slow’ (condition velocities below 20 m/s). Evidence was obtained that ‘fast’ cortico-fugal excitatory postsynaptic potentials are mediated by ‘fast’ cortico-bulbar fibres, and ‘slow’ excitatory postsynaptic potentials by the ‘slow’ ones. It was found that reticulo-spinal neurons with axon conduction velocities of 10.8–65 m/s can be activated by both ‘fast’ and ‘slow’ cortico-bulbar fibres, and the neurons with conduction velocities above 65 m/s only by the ‘slow’ ones. The background activity of reticulo-spinal neurons with slow conducting axons can be characterized as ‘tonic’ (with relatively uniform interspike interval distribution) while the activity of ‘fast’ neurons as ‘phasic’ (with significant grouping of discharges). The possible functional role of the differentiated cortico-reticulo-spinal connections is discussed. |
| Databáze: | OpenAIRE |
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