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• W2783457503 abstract "The spontaneous and paroxysmal cerebral cortical synchronized activity was used as reference to study the cortical impact exerted on subcortical neurons. The sensorimotor cortical synchronized activity spread down to subcortical structures receiving direct cortical input, including neuronal populations that originate descending rubrospinal, tectospinal and reticulospinal motor axons, and to a somatosensory relay station, the cuneate nucleus. Lesion of the pyramidal tract abolished the cortically induced synchronization of the activity of contralateral cuneate nucleus neurons. The neocortex and the thalamus form an oscillatory network modulated by ascending inhibitory and excitatory influences arising mostly in the brainstem. While the cerebral cortical oscillatory activity during different behavioral states and anesthesia has been preferentially studied in conjunction with reciprocal thalamic rhythmicity 7 (and references therein), few studies have dealt with the problem of coherent activity between ensembles of neurons at multiple levels of the brain. 3,5,8 Since the long-axoned neocortical neurons present oscillatory activity, 6 it is expected that these neurons would transmit the major cortical rhythms to their targets. Accordingly, we decided to study whether the cerebral cortex may impose the patterns of its activity on subcortical structures targeted by corticofugal fibers. Spontaneous sensorimotor cortical field potentials and electrically induced paroxysmal activity were correlated with the extracellular activity of different subcortical structures. A total of 12 cats of either sex (2.2‐4.5 kg) were anesthetized (a-chloralose, 60 mg/kg, i.p.), artificially respired and routinely subjected to a bilateral pneumothorax. A craniotomy was performed over the sensorimotor cortex, and a set of six bipolar electrodes mounted in a tower and lowered to 1.5 mm deep to electrically stimulate the precruciate primary motor (MCx) and postcruciate primary somatosensory (SSCx) cortices to induce paroxysmal cortical discharges and to observe their impact on subcortical structures. A concentric bipolar electrode was positioned at 1 mm depth in the lateral tip of the cruciate sulcus to differentially record the depth electrocorticogram (ECoG) activity between the inner (active) and the outer (reference) leads, separated by 500 mm. Tungsten recording electrodes (1‐5 MV resistance) were lowered ipsilaterally into the inferior laminae of the superior colliculus (SC), the magnocellular red nucleus (mRN) and the substantia nigra (SN), and contralaterally into the nucleus reticularis gigantocellularis (NRGc) and the middle main cuneate nucleus (CN). Contrary to the SN, the" @default.
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• W2783457503 date "1999-01-01" @default.
• W2783457503 modified "2023-09-24" @default.
• W2783457503 title "Letter to Neuroscience CORTICO-SUBCORTICAL SYNCHRONIZATION IN THE CHLORALOSE- ANESTHETIZED CAT" @default.
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