[Connections between the posterior lateral nucleus of the thalamus and the cortex of the cat suprasylvian gyrus].
Responses of neurons in the thalamic nucleus lateralis posterior (LP) to the stimulation of area 5b and 21 of the suprasylvian gyrus were studied in unanesthetized immobilized cats. Antidromic responses of these neurons indicate the existence of a direct pathways from LP to area 5b and 21. Such pathways are more extensive to area 5b. Relatively long latencies (1.2--60.0 ms) of antidromic responses show that axons of these neurons are slowly conducting (0.3--16.6 m/s). Short-latent 2--3 ms orthodromic responses to LP neurons indicate the existence of a direct pathway from the suprasylvian cortex to LP. Input to LP from area 5b is more powerful than from area 21. The converence of volleys from both areas is seen in 44% of investigated neurons. The stimulation of the suprasylvian cortex evokes postsynaptic inhibition in the most LP neurons.
D000818:Animals; D001931:Brain Mapping; D002415:Cats; D002540:Cerebral Cortex / Q000502:physiology*; D008564:Membrane Potentials; D009433:Neural Inhibition; D009434:Neural Pathways; D011930:Reaction Time; D013570:Synaptic Membranes / Q000502:physiology; D013787:Thalamic Nuclei / Q000502:physiology*
O sviaziakh zadnego lateral'nogo iadra talamusa s koroĭ suprasil'vievoĭ izviliny koshki