Abstract
The effects of gastric distension and electrical stimulation of the dorsomedial medulla on neurons within the parabrachial nucleus (PB) were investigated electrophysiologically in urethane-chlorarose anesthetized rats. Among 74 neurons tested, electrical stimulation of the nucleus of the solitary tract (NTS) excited 30 neurons (excitatory neurons) and inhibited 14 neurons (inhibitory neurons). Fourteen neurons increased and 12 neurons decreased their discharge rates in response to gastric distension. Twenty-two neurons responded to both electrical stimulation of the NTS and gastric distension. Both excitatory and inhibitory neurons showed either an increase or a decrease in discharge rate responding to gastric distension. Furthermore, three neurons that decreased their discharge rates and two neurons that increased their discharge rates during gastric distension also responded to intravenous administration of metaraminol indicating some effect of baroreceptor activation on the neural activity. The responses of another 49 neurons in the PB to electrical stimulation of area postrema and gastric distension were analyzed. Electrical stimulation of the AP excited 14 neurons and inhibited only one neuron. Five neurons increased and seven neurons decreased their discharge rates in response to gastric distension. Only one inhibitory neuron responded to gastric distension. These observations suggested that the PB neurons received gastric mechanoreceptive inputs from the NTS.
| Original language | English |
|---|---|
| Pages (from-to) | 221-229 |
| Number of pages | 9 |
| Journal | Journal of the Autonomic Nervous System |
| Volume | 48 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1994 |
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Keywords
- Area postrema
- Gastric distension
- Mechanoreceptor
- Nucleus of the solitary tract
- Parabrachial nucleus
- Stomach
ASJC Scopus subject areas
- Physiology
- Clinical Neurology
- Neuroscience(all)
Cite this
Effects of gastric distension and electrical stimulation of dorsomedial medulla on neurons in parabrachial nucleus of rats. / Suemori, Kazuhiko; Kobashi, Motoi; Adachi, Akira.
In: Journal of the Autonomic Nervous System, Vol. 48, No. 3, 1994, p. 221-229.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of gastric distension and electrical stimulation of dorsomedial medulla on neurons in parabrachial nucleus of rats
AU - Suemori, Kazuhiko
AU - Kobashi, Motoi
AU - Adachi, Akira
PY - 1994
Y1 - 1994
N2 - The effects of gastric distension and electrical stimulation of the dorsomedial medulla on neurons within the parabrachial nucleus (PB) were investigated electrophysiologically in urethane-chlorarose anesthetized rats. Among 74 neurons tested, electrical stimulation of the nucleus of the solitary tract (NTS) excited 30 neurons (excitatory neurons) and inhibited 14 neurons (inhibitory neurons). Fourteen neurons increased and 12 neurons decreased their discharge rates in response to gastric distension. Twenty-two neurons responded to both electrical stimulation of the NTS and gastric distension. Both excitatory and inhibitory neurons showed either an increase or a decrease in discharge rate responding to gastric distension. Furthermore, three neurons that decreased their discharge rates and two neurons that increased their discharge rates during gastric distension also responded to intravenous administration of metaraminol indicating some effect of baroreceptor activation on the neural activity. The responses of another 49 neurons in the PB to electrical stimulation of area postrema and gastric distension were analyzed. Electrical stimulation of the AP excited 14 neurons and inhibited only one neuron. Five neurons increased and seven neurons decreased their discharge rates in response to gastric distension. Only one inhibitory neuron responded to gastric distension. These observations suggested that the PB neurons received gastric mechanoreceptive inputs from the NTS.
AB - The effects of gastric distension and electrical stimulation of the dorsomedial medulla on neurons within the parabrachial nucleus (PB) were investigated electrophysiologically in urethane-chlorarose anesthetized rats. Among 74 neurons tested, electrical stimulation of the nucleus of the solitary tract (NTS) excited 30 neurons (excitatory neurons) and inhibited 14 neurons (inhibitory neurons). Fourteen neurons increased and 12 neurons decreased their discharge rates in response to gastric distension. Twenty-two neurons responded to both electrical stimulation of the NTS and gastric distension. Both excitatory and inhibitory neurons showed either an increase or a decrease in discharge rate responding to gastric distension. Furthermore, three neurons that decreased their discharge rates and two neurons that increased their discharge rates during gastric distension also responded to intravenous administration of metaraminol indicating some effect of baroreceptor activation on the neural activity. The responses of another 49 neurons in the PB to electrical stimulation of area postrema and gastric distension were analyzed. Electrical stimulation of the AP excited 14 neurons and inhibited only one neuron. Five neurons increased and seven neurons decreased their discharge rates in response to gastric distension. Only one inhibitory neuron responded to gastric distension. These observations suggested that the PB neurons received gastric mechanoreceptive inputs from the NTS.
KW - Area postrema
KW - Gastric distension
KW - Mechanoreceptor
KW - Nucleus of the solitary tract
KW - Parabrachial nucleus
KW - Stomach
UR - http://www.scopus.com/inward/record.url?scp=0028237893&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028237893&partnerID=8YFLogxK
U2 - 10.1016/0165-1838(94)90051-5
DO - 10.1016/0165-1838(94)90051-5
M3 - Article
VL - 48
SP - 221
EP - 229
JO - Autonomic Neuroscience: Basic and Clinical
JF - Autonomic Neuroscience: Basic and Clinical
SN - 1566-0702
IS - 3
ER -