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- W2023955059 abstract "Intracellular recordings and labelings with horseradish peroxidase (HRP) of expiratory (E) neurons were performed in decerebrate, paralyzed, and ventilated rats. A total of 37 neurons were recorded, from which 4 cells and 1 axon were labeled. They were located in two regions of the ventrolateral medulla. One was in the rostral portion of the nucleus ambiguus just caudal to the facial nucleus, and the other in the nucleus retroambiguus at the level of the caudal medulla. These expiratory neurons had rhythmical changes in membrane potential similar to those reported in cat, i.e., a depolarization in the intervals between phrenic bursts which evolved in an augmenting (E-aug, n = 15), or bell-shaped or 'plateau' (E-all, n = 22) pattern until a rapid hyperpolarization at the start of inspiration. Both types were hyperpolarized during inspiration by chloride-dependent, inhibitory postsynaptic potentials (IPSPs) which were demonstrated in 17 neurons (10 E-aug and 7 E-all) from which reversal was obtained. Such IPSPs also existed during post-inspiration (stage I of expiration) in 4 of the 10 augmenting E neurons. They were identified by antidromic stimulation or HRP labeling, or both, as bulbospinal neurons (n = 2), cranial motoneurons (n = 4), or not antidromically activated (NAA) neurons (n = 31). All the identified bulbospinal neurons and the motoneurons exhibited an E-all pattern. The expiratory neurons of the caudal medulla had various projections as demonstrated with HRP labeling: one bulbospinal neuron with ipsilateral axon giving off intramedullary collaterals, and NAA neurons with rostral medullary projections or with axons crossing the midline.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2023955059 date "1992-04-01" @default.
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- W2023955059 title "Medullary expiratory neurons in the decerebrate rat: an intracellular study" @default.
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- W2023955059 doi "https://doi.org/10.1016/0006-8993(92)90687-5" @default.
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