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...
Microelectrode recordings from the SII cortical area of chloralose-anaesthetized cats have been performed in order to ascertain the peripheral reactivity of the neurones receiving cortico-cortical projections from the ipsilateral SI area. With glass micropipettes, extracellular records were obtained from 64 cells isolated in the forepaw focus, and each one was tested with stimulation both of its peripheral receptive field (PRF) and of the forepaw region of the SI. Twenty-two such units were endowed...
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...
The synaptic events, induced by transcallosal afferents in somesthetic cortical neurones were studied with intracellular technique in 21 units (14 belonging to SI and 7 to SII), out of a larger sample whose characteristics of transcallosal as well as peripheral reactivity were determined extracellularly. The recordings were obtained from chloralose-anaesthetized, curarized cats by means of glass micropipettes (2M K-citrate or 2.5 M KCl; 10-50 M in resistance) and DC-, AC-amplifying conventional...
Extending our previous research concerned with the reception of callosal messages by the cortical somatosensory areas of the cat, the present experiments were devoted to studying what kind of somesthetic information is transmitted through the fibers of the corpus callosum (CC). By recording electrical activity through coaxial macroelectrodes and tungsten microelectrodes directly from the CC of chloralose-anaesthetized cats, a set of fibers was identified in the rostral part of this commissure (somesthetic...
Download Results (CSV)