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Text
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URL Address
<a href="http://doi.org/10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8</a>
Pages
534–560
Issue
4
Volume
403
Dublin Core
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Title
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Brainstem neurons with descending projections to the spinal cord of two elasmobranch fishes: thornback guitarfish, Platyrhinoidis triseriata, and horn shark, Heterodontus francisci.
Publisher
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The Journal of comparative neurology
Date
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1999
1999-01
Subject
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*Stilbamidines; Animals; Axonal Transport; Brain Stem/*anatomy & histology/physiology; Diencephalon/anatomy & histology/physiology; Fishes/*anatomy & histology; Fluorescent Dyes; Horseradish Peroxidase; Mesencephalon/anatomy & histology/physiology; Neural Pathways/anatomy & histology/physiology; Neurons/*cytology/physiology; Pons/anatomy & histology/physiology; Reticular Formation/anatomy & histology/physiology; Species Specificity; Spinal Cord/*anatomy & histology/physiology
Creator
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Cruce W L; Stuesse S L; Northcutt R G
Description
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We studied two cartilaginous fishes and described their brainstem supraspinal projections because most nuclei in the reticular formation can be identified that way. A retrogradely transported tracer, horseradish peroxidase or Fluoro-Gold, was injected into the spinal cord of Platyrhinoidis triseriata (thornback guitarfish) or Heterodontus fransisci (horn shark). We described labeled reticular cells by their position, morpohology, somatic orientation, dendritic processes, and laterality of spinal projections. Nineteen reticular nuclei have spinal projections: reticularis (r.) dorsalis, r. ventralis pars alpha and beta, r. gigantocellularis, r. magnocellularis, r. parvocellularis, r. paragigantocellularis lateralis and dorsalis, r. pontis caudalis pars alpha and beta, r. pontis oralis pars medialis and lateralis, r. subcuneiformis, r. peduncularis pars compacta, r. subcoeruleus pars alpha, raphe obscurus, raphe pallidus, raphe magnus, and locus coeruleus. Twenty nonreticular nuclei have spinal projections: descending trigeminal, retroambiguus, solitarius, posterior octaval, descending octaval, magnocellular octaval, ruber, Edinger-Westphal, nucleus of the medial longitudinal fasciculus, interstitial nucleus of Cajal, latral mesencephalic complex, periventricularis pretectalis pars dorsalis, central pretectal, ventromedial thalamic, posterior central thalamic, posterior dorsal thalamic, the posterior tuberculum, and nuclei B, F, and J. The large number of distinct reticular nuclei with spinal projections corroborates the hypothesis that the reticular formation of elasmobranches is complexly organized into many of the same nuclei that are found in frogs, reptiles, birds, and mammals.
Identifier
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<a href="http://doi.org/10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8" target="_blank" rel="noreferrer noopener">10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8</a>
Rights
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*Stilbamidines
1999
Animals
Axonal Transport
Brain Stem/*anatomy & histology/physiology
Cruce W L
Diencephalon/anatomy & histology/physiology
Fishes/*anatomy & histology
Fluorescent Dyes
Horseradish Peroxidase
Mesencephalon/anatomy & histology/physiology
Neural Pathways/anatomy & histology/physiology
Neurons/*cytology/physiology
Northcutt R G
Pons/anatomy & histology/physiology
Reticular Formation/anatomy & histology/physiology
Species Specificity
Spinal Cord/*anatomy & histology/physiology
Stuesse S L
The Journal of comparative neurology