Postsynaptic potentials in the mesencephalic and pontomedullar reticular regions underlying descending limbic influences
1973; Elsevier BV; Volume: 56; Linguagem: Inglês
10.1016/0006-8993(73)90329-6
ISSN1872-6240
AutoresRosemarie Grantyn, Marco Margnelli, M Mancia, A Grantyn,
Tópico(s)EEG and Brain-Computer Interfaces
ResumoInfluences exerted by cortical and subcortical limbic structures upon the brain stem reticular formation were analyzed by intracellular recordings from mesencephalic (MES) and bulbo-pontine (BP) reticular neurons in ence´phale isole´cats. The results indicate that: (1) Limbic effects on reticular neurons are predominantly excitatory. (2) Qualitatively similar responses are revealed in cells tested by stimulation of different limbic sites. (3) The fraction of neurons activates by limbic inputs is higher in the MES as compared to the BP region. (4) Neurons with long ascending or descending axons identified by antidromic invasion are less responsive than unidentified units. (5) Descending limbic influences are transmitted by oligo- and polysynaptic pathways, the former being preferentially linked to BP, the latter to MES regions. The functional significance of the excitatory limbic input to the brain stem reticular formation is discussed.
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