title: [Transcommissural afferent projections of the lemniscal and spino-reticulo-thalamic systems].
abstract: In cats with section of classic, contralateral somatosensory pathways of the fore-leg at the midbrain level an instrumental defensive reflex "to this leg" can be elaborated. This fact suggests that the intact ipsilateral afferent somatosensory pathways of the brain-stem transmit kinsthetic excitations. The electrophysiological study (acute experiments under nembutal anesthesia) of somatosensory projections of the fore-leg, contralateral to the midbrain section, revealed bilateral evoked responses in the somato-sensory cortical areas with a latency of 18-20 msec. These responses evidence bilateral afferent projections of the ipsilateral part of the spinoreticulo-thalamic system. They constitute the functional basis for the formation of this conditioned instrumental defensive reflex. The lemniscal system as well as the ipsilateral part of spino-reticulo-thalamic system send bilateral afferent projections to the somatosensory structures of the brain.
mesh_terms: D000818:Animals; D001931:Brain Mapping; D002415:Cats; D003216:Conditioning, Operant / Q000502:physiology; D005071:Evoked Potentials; D005552:Forelimb / Q000294:innervation; D007699:Kinesthesis / Q000502:physiology*; D008526:Medulla Oblongata / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D012154:Reticular Formation / Q000502:physiology*; D013003:Somatosensory Cortex / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology*; D013133:Spinothalamic Tracts / Q000502:physiology; D013681:Tegmentum Mesencephali / Q000502:physiology; D013787:Thalamic Nuclei / Q000502:physiology*
vernacular_title: Transkomissural'nye afferentnye proektsii lemniskovoĭ i spino-retikulo-talamicheskoĭ sistem.