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Hypothalamic‐evoked effects in cat nucleus tractus solitarius facilitating chemoreceptor reflexes
Author(s) -
Silva-Carvalho L,
Dawid-Milner MS,
Goldsmith GE,
Spyer KM
Publication year - 1993
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/expphysiol.1993.sp003696
Subject(s) - baroreceptor , chemoreceptor , stimulation , inhibitory postsynaptic potential , cats , reflex , excitatory postsynaptic potential , carotid sinus , neuroscience , chemistry , medicine , biology , heart rate , receptor , blood pressure
In anaesthetized cats intracellular recordings in the nucleus tractus solitarius (NTS) have been used to identify neurones receiving inputs from the carotid sinus nerve (SN), the aortic nerve and hypothalamic defence area (HDA). In forty‐four neurones activated by SN stimulation HDA activation evoked an IPSP in fourteen (32%) and an EPSP in eight (11%). Those neurones receiving an HDA‐evoked IPSP, and tested for reflex inputs, responded only to baroreceptor activation. Neurones receiving HDA‐evoked EPSPs responded only to chemoreceptor activation. In three neurones unaffected by SN stimulation, short latency inputs from HDA were observed, suggesting direct monosynaptic inputs.