Abstract
AbstractElectrophoretically administered acetylcholine (ACh) excited neurones located within the ventro‐basal thalamic complex of cats anesthetised with pentobarbital. All ACh sensitive neurones were fired synaptically by volleys in cutaneous nerve fibres; thalamic relay neurones which were fired antidromically from the primary sensory cortex were more sensitive than thalamic interneurones. In comparison with Renshaw cells the excitatory action of ACh was of slow onset and prolonged duration; the spontaneous spindle activity of some cells was depressed prior to excitation. Possible explanations of these time differences between the excitant of ACh upon thalamic and Renshaw cells are discussed.
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