Trigeminal nociceptive neurons in the subnucleus reticularis ventralis. II. Ascending projection

Ascending projection of trigeminal nociceptive neurons in the subnucleus reticularis ventralis (SRV) was studied in urethane/chloralose-anesthetized cats. Thalamic neurons having complex trigeminal receptive fields similar to those of SRV neurons were found in the intralaminar nuclei, i.e. nuclei ce...

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Bibliographic Details
Published in:Neuroscience research 1991-06, Vol.11 (1), p.18-27
Main Authors: Yokota, Toshikatsu, Koyama, Natsu, Nishikawa, Yasuo, Hasegawa, Akinori
Format: Article
Language:English
Subjects:
Afferent Pathways - anatomy & histology
Animals
Biological and medical sciences
Brain Mapping
Cats - anatomy & histology
Cats - physiology
Ear, External - innervation
Electric Stimulation
Face - innervation
Fundamental and applied biological sciences. Psychology
Intralaminar nuclei
Lamina VII
Neurons - physiology
Nociceptors - physiology
Reticular formation
Reticular Formation - anatomy & histology
Reticular Formation - physiology
Somesthesis and somesthetic pathways (proprioception, exteroception, nociception)
interoception
electrolocation. Sensory receptors
Splanchnic Nerves - physiology
Subnucleus reticularis ventralis
Thalamus
Thalamus - anatomy & histology
Thalamus - physiology
Tongue - innervation
Trigeminal Nerve - anatomy & histology
Trigeminal Nerve - physiology
Trigeminal pain
Vertebrates: nervous system and sense organs
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Summary:Ascending projection of trigeminal nociceptive neurons in the subnucleus reticularis ventralis (SRV) was studied in urethane/chloralose-anesthetized cats. Thalamic neurons having complex trigeminal receptive fields similar to those of SRV neurons were found in the intralaminar nuclei, i.e. nuclei centralis lateralis, centralis medialis and parafascicularis. About half of the SRV units tested were antidromically activated by electrical stimulation of the nucleus centralis lateralis. It was also found that a significant proportion of SRV units was antidromically activated by electrical stimulation of the mesencephalic reticular formation (MRF), and retrogradely labelled neurons were found in the SRV after HRP injection into the MRF. These findings suggest that SRV neurons relay trigeminal nociceptive inputs directly or indirectly via the MRF to the intralaminar nuclei.
ISSN:0168-0102
1872-8111
DOI:10.1016/0168-0102(91)90063-5