Topographic organization of descending projection neurons to the spinal cord of the goldfish, Carassius auratus

Rao, P. D. Prasada; Jadhao, Arun G.; Sharma, S. C.

doi:10.1016/0006-8993(93)90158-j

Cited by 38 publications

(41 citation statements)

References 19 publications

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“…Prasada Rao et al (1987) report that descending spinal neurons in the goldfish Carassius are also found in the anterior and posterior octaval nuclei; however, we disagree with their interpretation of these nuclei. The anterior octaval nucleus described by Prasada Rao et al (1987) corresponds very closely in position (dorsal and medial to the spinal trigeminal and secondary gustatory tracts, see their Fig.…”

Section: Discussioncontrasting

confidence: 91%

“…The anterior octaval nucleus described by Prasada Rao et al (1987) corresponds very closely in position (dorsal and medial to the spinal trigeminal and secondary gustatory tracts, see their Fig. 1H) to the spinal trigeminal nucleus as identified by McCormick and Braford in Ictalurus (1993).…”

Section: Discussionsupporting

confidence: 62%

“…Prominent descending projections from the nuclei of the reticular formation and the raphe nuclei are found in all vertebrates, and the descending reticulospinal projections in catfish are essentially the same as those described in other actinopterygian fishes (Kimmel et al, 1982;Northcutt, 1983;Hlavacek et al, 1983;Oka et al 1986;Prasada Rao et al, 1987;Behrend and Donicht, 1990; Lee et al, 1993). The reticulospinal pathways are believed to be an essential premotor region for organizing the activity of motorneurons in the spinal cord and brainstem.…”

Section: Discussionmentioning

confidence: 53%

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Descending neural projections to the spinal cord in the channel catfish,Ictalurus Punctatus

1998

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Retrograde transport of horseradish peroxidase was used to determine the descending projections to the spinal cord in an otophysan fish, the channel catfish, Ictalurus punctatus. The majority of cells projecting to the spinal cord are located in the reticular formation, which is organized into rhombomeric segments. Vestibulospinal neurons are located in the descending, magnocellular, and tangential octaval nuclei, as well as in the medial octavolateralis nucleus of the lateral line system. Cells in the facial lobe project to the spinal cord. Additionally, axons of cells of the trigeminal system and the nucleus of the lateral lemniscus project caudally into the spinal cord. In the midbrain, descending spinal projections arise from cells of the medial longitudinal fasciculus and the red nucleus. More rostrally, cells of the ventrolateral thalamus, dorsal periventricular hypothalamus, central pretectal and magnocellular preoptic nuclei also project to the cord. The results of this study indicate that there are a number of homologies in the descending systems of bony fishes and other vertebrate taxa, including tetrapods. We also provide further evidence that a red nucleus is present in the brains of bony fishes and is therefore a primitive vertebrate character antedating the evolution of tetrapods. Anat.

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Section: Discussioncontrasting

confidence: 91%

Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 53%

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Descending neural projections to the spinal cord in the channel catfish,Ictalurus Punctatus

1998

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“…The mesencephalic prespinal neurons are similar to those described in other species (Prasada Rao et al, 1987;Lee and Eaton, 1991) and will not be described in detail here. Briefly, clusters of labeled cells extended laterally and rostrally on both sides of the mlf.…”

Section: Mesencephalic Reticular Formationsupporting

confidence: 51%

“…One important finding of this study is that a localized subset of reticulospinal cells, those of RS5, receive functional input from a gustatory lobe. The gustato-reticulospinal projection therefore represents a small part of the extensive reticulospinal system, which has been studied in aquatic species such as the lamprey (Rovainen, 1967(Rovainen, , 1974, zebrafish (Kimmel et al, 1982;Mendelson, 1986;Mendelson and Kimmel, 1986;Metcalfe et al, 1986), and more recently goldfish (Prasada Rao et al, 1987;Lee and Eaton, 1991;Lee et al, 1993) and dogfish (Timerick et al, 1992). The current study allowed us to define the origin and level of the gustatory projections in relation to the entire reticulospinal system in a catfish.…”

Section: Medullary Gustatospinal Projectionsmentioning

confidence: 93%

Parallel Medullary Gustatospinal Pathways In a Catfish: Possible Neural Substrates for Taste-Mediated Food Search

Finger

1997

J. Neurosci.

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Taste and tactile fibers in the facial nerve of catfish innervate extraoral taste buds and terminate somatotopically in the facial lobe (FL)-a medullary structure crucial for gustatory-mediated food search. The present study was performed to determine the neural linkages between the gustatory input and the spinal motor output. Spinal injections of horseradish peroxidase (HRP) label spinopetal cells in the octaval nuclei, the nucleus of the medial longitudinal fasciculus, and reticulospinal neurons (Rsps) in the brainstem medial reticular formation (RF), including the Mauthner cell. A somatotopically organized, direct faciospinal system originating from superficial cells scattered in the lateral lobule of the facial lobe (ll) is also labeled. (1) a topographically organized direct faciospinal pathway, and (2) an indirect facioreticulospinal pathway in which reticular neurons process and integrate gustatory information before influencing spinal circuitry for motor control during food search.

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Secondary vestibulo-oculomotor projections in larval sea lamprey: Anterior octavomotor nucleus

Pombal

Rodicio

Anadón³

1996

J. Comp. Neurol.

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The ventral octavolateral area of lampreys contains three nuclei: the anterior, intermediate and posterior octavomotor nuclei, formed of large neurons that are contacted by thick primary vestibular fibres. We used horseradish peroxidase (HRP) or fluorescein-dextran-amine (FDA) labelling to study the projections of the anterior octavomotor nucleus (AON) in the larval sea lamprey, Petromyzon marinus. The tracers were injected either in the AON, the oculomotor nucleus or the rostralmost spinal cord. HRP injection in the AON labelled thick axons that coursed to the basal mesencephalic tegmentum, where most decussate and project to the oculomotor nucleus and the third Müller cell. Electron microscopy confirmed that AON axons contact with the contralateral third Müller cell and with oculomotor neurons. Some AON axons run in the mesencephalic tegmentum and the ventral diencephalon. An AON axon was observed to run close to the axon of the contralateral third Müller cell, establishing what appeared to be en passant contacts. HRP injection in the AON also revealed commissural fibres projecting to the contralateral octavolateral area. HRP or FDA injections in the oculomotor nucleus labelled both large and small neurons of the AON, mostly contralateral to the injection site, as well as of cells in the intermediate octavomotor nucleus, mainly ipsilateral. HRP injection in the AON or in the rostral spinal cord did not reveal any projections from the AON to the spinal cord. Our results indicate that the pattern of octavo-oculomotor connections in the lamprey is different from that observed in other vertebrates.

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Topographic organization of descending projection neurons to the spinal cord of the goldfish, Carassius auratus

Cited by 38 publications

References 19 publications

Descending neural projections to the spinal cord in the channel catfish,Ictalurus Punctatus

Descending neural projections to the spinal cord in the channel catfish,Ictalurus Punctatus

Parallel Medullary Gustatospinal Pathways In a Catfish: Possible Neural Substrates for Taste-Mediated Food Search

Secondary vestibulo-oculomotor projections in larval sea lamprey: Anterior octavomotor nucleus

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