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Text
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URL Address
<a href="http://doi.org/10.1002/cne.903080211" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/cne.903080211</a>
Pages
277–292
Issue
2
Volume
308
Dublin Core
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Title
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Localization of serotonin, tyrosine hydroxylase, and leu-enkephalin immunoreactive cells in the brainstem of the horn shark, Heterodontus francisci.
Publisher
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The Journal of comparative neurology
Date
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1991
1991-06
Subject
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Animals; Brain Mapping; Brain Stem/anatomy & histology/*chemistry; Diencephalon/anatomy & histology/chemistry; Enkephalin; Leucine/*analysis; Mammals/anatomy & histology; Mesencephalon/anatomy & histology/chemistry; Neurons/chemistry; Reticular Formation/anatomy & histology/chemistry; Serotonin/*analysis; Sharks/*anatomy & histology; Species Specificity; Spinal Cord/anatomy & histology/chemistry; Tyrosine 3-Monooxygenase/*analysis
Creator
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Stuesse S L; Cruce W L; Northcutt R G
Description
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In previous studies on reptiles and elasmobranchs, we determined that some reticular groups are either absent or may be displaced compared to their locations in mammals. For example, nucleus raphe dorsalis, the largest serotoninergic cell group in mammals, is not present in rays, skates, or guitarfish. In the present study, we chose heterodontid sharks, a sister group to these batoids, for an out-group comparison of this and other characters. We identified cells in the brainstem of Heterodontus francisci by use of antibodies against tyrosine hydroxylase, serotonin, or leu-enkephalin and compared the distribution of these nuclei to descriptions in mammals and other elasmobranchs. The majority of tyrosine hydroxylase-positive cells were found in the midbrain tegmentum (A8-A10) and the hypothalamus. In addition, putative A1, A2, A5, A7 (noradrenergic) groups were found in the metencephalon and myelencephalon. Serotonin-positive cells were found in raphe nuclei and scattered lateral to the raphe. We identified probable homologues to raphe pallidus, raphe obscurus, raphe magnus, and raphe centralis superior (B8) cell groups, which have been described in mammals. A cluster of cells dorsomedial to the medial longitudinal fasciculus was identified as raphe dorsalis. The distributions of leu-enkephalin and serotonin immunoreactive cells were similar to each other, but the tyrosine-hydroxylase immunoreactive cells rarely intermingle with the former two immunoreactive cell types. Other reticular groups that contained both serotonin- and leu-enkephalin-positive cells included reticularis (r.) ventralis, r. magnocellularis, r. paragigantocellularis lateralis, r. pontis caudalis, and r. pontis oralis medialis and lateralis. Thus, this shark contains many of the major brainstem raphe and catecholaminergic cell groups described for rats, but the relative distribution of the immunopositive cell groups differs in mammals and cartilaginous fish.
Identifier
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<a href="http://doi.org/10.1002/cne.903080211" target="_blank" rel="noreferrer noopener">10.1002/cne.903080211</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).
1991
Animals
Brain Mapping
Brain Stem/anatomy & histology/*chemistry
Cruce W L
Diencephalon/anatomy & histology/chemistry
Enkephalin
Leucine/*analysis
Mammals/anatomy & histology
Mesencephalon/anatomy & histology/chemistry
Neurons/chemistry
Northcutt R G
Reticular Formation/anatomy & histology/chemistry
Serotonin/*analysis
Sharks/*anatomy & histology
Species Specificity
Spinal Cord/anatomy & histology/chemistry
Stuesse S L
The Journal of comparative neurology
Tyrosine 3-Monooxygenase/*analysis