Abstract
Activities of 53 neurons in the brain stem were recorded with chronically implanted fine wires in freely eating and drinking rats. Twenty units were isolated from the trigeminal mesencephalic nucleus; 18 were spindle afferents and 2 periodontal afferents. The spindle units were classified into 4 types: 5 units showed rhythmical activity related only to the jaw opening phase during both licking and chewing, 8 units discharged at jaw opening phase during licking, but both at jaw opening and jaw closing phases during eating, 2 units increased phasic activity at jaw opening phase during licking, but increased tonically independent of jaw movements during eating, and the remaining 3 units responded only at jaw closing phase both in licking and eating behavior. Nine units were assumed to be alpha motoneurons isolated from the trigeminal motor nucleus; 2 innervating the temporalis muscle, 3 the masseter muscle, 2 the digastric muscle, and the remaining 2 presumably the pterygoid muscles. These units, with a mean tonic spontaneous rate of about 10 impulses/ s, showed phase-related rhythmical burst activities during licking and eating. Four units were isolated from the trigeminal main sensory nucleus. Sixteen units were isolated from the medullary reticular formation and 1 from the pontine reticular formation. Of these 16 units, 3 from the parvocellular part of the medullary reticular formation were presumably premotor interneurons, and 3 units in the "intertrigeminal region", 2 units in the "juxtatrigeminal region", and 8 units in the "supratrigeminal region" were responsive to multiple sensory modalities. These results demonstrate that almost all the units sampled showed characteristic rhythmic activities associated with the position of the tongue or mandible during rhythmical jaw movements.
| Original language | English |
|---|---|
| Pages (from-to) | 386-400 |
| Number of pages | 15 |
| Journal | Experimental Brain Research |
| Volume | 76 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jul 1989 |
| Externally published | Yes |
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Keywords
- Brain stem neurons
- Licking
- Mastication
- Muscle afferents
- Reticular formation
- Trigeminal nuclei
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Sensory and motor responses of trigeminal and reticular neurons during ingestive behavior in rats. / Yamamoto, T.; Matsuo, R.; Kiyomitsu, Y.; Kitamura, R.
In: Experimental Brain Research, Vol. 76, No. 2, 07.1989, p. 386-400.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sensory and motor responses of trigeminal and reticular neurons during ingestive behavior in rats
AU - Yamamoto, T.
AU - Matsuo, R.
AU - Kiyomitsu, Y.
AU - Kitamura, R.
PY - 1989/7
Y1 - 1989/7
N2 - Activities of 53 neurons in the brain stem were recorded with chronically implanted fine wires in freely eating and drinking rats. Twenty units were isolated from the trigeminal mesencephalic nucleus; 18 were spindle afferents and 2 periodontal afferents. The spindle units were classified into 4 types: 5 units showed rhythmical activity related only to the jaw opening phase during both licking and chewing, 8 units discharged at jaw opening phase during licking, but both at jaw opening and jaw closing phases during eating, 2 units increased phasic activity at jaw opening phase during licking, but increased tonically independent of jaw movements during eating, and the remaining 3 units responded only at jaw closing phase both in licking and eating behavior. Nine units were assumed to be alpha motoneurons isolated from the trigeminal motor nucleus; 2 innervating the temporalis muscle, 3 the masseter muscle, 2 the digastric muscle, and the remaining 2 presumably the pterygoid muscles. These units, with a mean tonic spontaneous rate of about 10 impulses/ s, showed phase-related rhythmical burst activities during licking and eating. Four units were isolated from the trigeminal main sensory nucleus. Sixteen units were isolated from the medullary reticular formation and 1 from the pontine reticular formation. Of these 16 units, 3 from the parvocellular part of the medullary reticular formation were presumably premotor interneurons, and 3 units in the "intertrigeminal region", 2 units in the "juxtatrigeminal region", and 8 units in the "supratrigeminal region" were responsive to multiple sensory modalities. These results demonstrate that almost all the units sampled showed characteristic rhythmic activities associated with the position of the tongue or mandible during rhythmical jaw movements.
AB - Activities of 53 neurons in the brain stem were recorded with chronically implanted fine wires in freely eating and drinking rats. Twenty units were isolated from the trigeminal mesencephalic nucleus; 18 were spindle afferents and 2 periodontal afferents. The spindle units were classified into 4 types: 5 units showed rhythmical activity related only to the jaw opening phase during both licking and chewing, 8 units discharged at jaw opening phase during licking, but both at jaw opening and jaw closing phases during eating, 2 units increased phasic activity at jaw opening phase during licking, but increased tonically independent of jaw movements during eating, and the remaining 3 units responded only at jaw closing phase both in licking and eating behavior. Nine units were assumed to be alpha motoneurons isolated from the trigeminal motor nucleus; 2 innervating the temporalis muscle, 3 the masseter muscle, 2 the digastric muscle, and the remaining 2 presumably the pterygoid muscles. These units, with a mean tonic spontaneous rate of about 10 impulses/ s, showed phase-related rhythmical burst activities during licking and eating. Four units were isolated from the trigeminal main sensory nucleus. Sixteen units were isolated from the medullary reticular formation and 1 from the pontine reticular formation. Of these 16 units, 3 from the parvocellular part of the medullary reticular formation were presumably premotor interneurons, and 3 units in the "intertrigeminal region", 2 units in the "juxtatrigeminal region", and 8 units in the "supratrigeminal region" were responsive to multiple sensory modalities. These results demonstrate that almost all the units sampled showed characteristic rhythmic activities associated with the position of the tongue or mandible during rhythmical jaw movements.
KW - Brain stem neurons
KW - Licking
KW - Mastication
KW - Muscle afferents
KW - Reticular formation
KW - Trigeminal nuclei
UR - http://www.scopus.com/inward/record.url?scp=0024334816&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024334816&partnerID=8YFLogxK
U2 - 10.1007/BF00247896
DO - 10.1007/BF00247896
M3 - Article
C2 - 2767190
AN - SCOPUS:0024334816
VL - 76
SP - 386
EP - 400
JO - Experimental Brain Research
JF - Experimental Brain Research
SN - 0014-4819
IS - 2
ER -