Experiments have been carried out in order to ascertain the peripheral origin of Group I-III deep afferent fibres, previously shown to project to the somesthetic region of the corpus callosum (SCR). In chloralose-anaesthetized cats some forelimb nerves and nerve branches (muscular branch of the deep radial nerve supplying the extensor carpi radialis, ECR; distal part of the same nerve containing also the branches to the interosseous membrane and carpal joints, NRP-D; muscular branch of the median...
The peripheral reactivity of cortical area 6 () of the Cat has been examined, in order to compare its features with those of the peripheral reactivity of area 4 (). Peripheral stimulation was actuated by single shocks to the skin applied in sequence by means of several needle-electrodes thrust into standard locations of limbs, trunk, neck and of the whisker region. With conventional electrophysiological techniques, in 19 animals extracellular records from 323 cortical neurones were obtained, 258...
Experiments have been carried out in order to study which ascending spinal pathways are utilized by peripherally-originated impulses and activating callosal fibres. In chloralose-anaesthetized cats stim uli of graded intensities were applied to the superficial (SRN) and deep (DRN) radial nerves. Mass potentials were recorded simultaneously from the cerebral cortex (SI, SII and 3a areas, according to the experiment), from the somesthetic callosal region (SCR) and, on some occasions, from the distal...
Microelectrode recordings (glass micropipettes filled with 2.5 M KCl) from the two subdivisions of the motor cortex (area and , [5]) of chloralose-anaesthetized, curarized cats have been performed in order to characterize the response properties of the neurones receiving projections from the n. ventralis lateralis (VL). Extracellular unitary activity was obtained from 345 cells (226 from area 6 and 119 from area 4). Each one was tested for the effects of the electrical stimulation of the dorsal...
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