A comparative study of spinal projections to the brain (except cerebellum) in three classes of poikilothermic vertebrates

Hayle, T. H.

doi:10.1002/cne.901490405

Cited by 82 publications

(17 citation statements)

References 16 publications

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“…In addition, anterogradely filled dense fibers terminals were observed in the ventrolateral RF of the medulla (Fig. 1 H-J, dots) as described for other species by Hayle (1973). The facial and reticulospinal projections are described in greater detail below.…”

Section: Prespinal Brainstem Neuronssupporting

confidence: 58%

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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Section: Prespinal Brainstem Neuronssupporting

confidence: 58%

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

Finger

1997

J. Neurosci.

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“…Though this brain area is highly multimodal, receiving input from most brain centers, including the spinal cord, the hypothalamus, and the telencephalon [Ebbesson and Schroeder, 1971;Hayle, 1973;Smeets, 1998], as well as being the site for termination of secondary octavolateralis fibers [Boord and Northcutt, 1982;Corwin and Northcutt, 1982], the lateral portion of this brain area also receives input from the tectum [Boord and Northcutt, 1982;Smeets, 1983] and is related, in part, to visual processing. Interestingly, cell groups in this area are identified that play an important role in controlled locomotion in elasmobranchs [Droge and Leonard, 1983a, b;Demski and Northcutt, 1996].…”

Section: Neuroecologymentioning

confidence: 99%

“…In chondrichthyans, this brain area is highly multimodal. The lateral portion of the tegmentum receives input from the spinal cord [Hayle, 1973], cerebellum [Smeets, 1998], and tectum [Boord and Northcutt, 1982;Smeets, 1983] and the lateral mesencephalic complex is the site for termination of secondary electrosensory, mechanosensory, and auditory fibers [Boord and Northcutt, 1982;Corwin and Northcutt, 1982], implicating this brain area in motor and sensory processing. The tegmentum receives afferents from the hypothalamus and is heavily interconnected with three areas of the telencephalic subpallium (area superficialis basalis, septum, and striatum) [Ebbesson and Schroeder, 1971].…”

Section: Introductionmentioning

confidence: 99%

Allometric Scaling of the Optic Tectum in Cartilaginous Fishes

Yopak

Lisney

2012

Brain Behav Evol

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In cartilaginous fishes (Chondrichthyes; sharks, skates and rays (batoids), and holocephalans), the midbrain or mesencephalon can be divided into two parts, the dorsal tectum mesencephali or optic tectum (analogous to the superior colliculus of mammals) and the ventral tegmentum mesencephali. Very little is known about interspecific variation in the relative size and organization of the components of the mesencephalon in these fishes. This study examined the relative development of the optic tectum and the tegmentum in 75 chondrichthyan species representing 32 families. This study also provided a critical assessment of attempts to quantify the size of the optic tectum in these fishes volumetrically using an idealized half-ellipsoid approach (method E), by comparing this method to measurements of the tectum from coronal cross sections (method S). Using species as independent data points and phylogenetically independent contrasts, relationships between the two midbrain structures and both brain and mesencephalon volume were assessed and the relative volume of each brain area (expressed as phylogenetically corrected residuals) was compared among species with different ecological niches (as defined by primary habitat and lifestyle). The relatively largest tecta and tegmenta were found in pelagic coastal/oceanic and oceanic sharks, benthopelagic reef sharks, and benthopelagic coastal sharks. The smallest tecta were found in all benthic sharks and batoids and the majority of bathyal (deep-sea) species. These results were consistent regardless of which method of estimating tectum volume was used. We found a highly significant correlation between optic tectum volume estimates calculated using method E and method S. Taxon-specific variation in the difference between tectum volumes calculated using the two methods appears to reflect variation in both the shape of the optic tectum relative to an idealized half-ellipsoid and the volume of the ventricular cavity. Because the optic tectum is the principal termination site for retinofugal fibers arising from the retinal ganglion cells, the relative size of this brain region has been associated with an increased reliance on vision in other vertebrate groups, including bony fishes. The neuroecological relationships between the relative size of the optic tectum and primary habitat and lifestyle we present here for cartilaginous fishes mirror those established for bony fishes; we speculate that the relative size of the optic tectum and tegmentum similarly reflects the importance of vision and sensory processing in cartilaginous fishes.

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“…Following tectal injections, retrograde labeled cells were found in the spinal cord of several vertebrate species, including fish [Hayle, 1973;Smeets, 1982;Becker et al, 1997;Prasada Rao and Sharma, 1999], amphibians [Wilczynski and Northcutt, 1977;Gruberg and Solish, 1978;Rettig, 1988], and reptiles [Ebbesson, 1967;Ulinski, 1977;Stein and Gaither, 1981;Welker et al, 1983;Pritz and Stritzel, 1989]. However, they could not be demonstrated in other species such as fish [Luiten, 1981;Northcutt, 1982;Fiebig et al, 1983;Oka et al, 1986;Schlussman et al, 1990] or reptiles [Ebbesson, 1969;Hay-le, 1973;Gruberg et al, 1979;Kishida et al, 1980].…”

Section: Spinal Cord Projectionsmentioning

confidence: 99%

Afferent Connections of the Optic Tectum in Lampreys: An Experimental Study

Arriba

Pombal²

2006

Brain Behav Evol

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Tectal afferents were studied in adult lampreys of three species (Ichthyomyzon unicuspis, Lampetra fluviatilis, and Petromyzon marinus) following unilateral BDA injections into the optic tectum (OT). In the secondary prosencephalon, neurons projecting to the OT were observed in the pallium, the subhipoccampal lobe, the striatum, the preoptic area and the hypothalamus. Following tectal injections, backfilled diencephalic cells were found bilaterally in: prethalamic eminence, ventral geniculate nucleus, periventricular prethalamic nucleus, periventricular pretectal nucleus, precommissural nucleus, magnocellular and parvocellular nuclei of the posterior commissure and pretectal nucleus; and ipsilaterally in: nucleus of Bellonci, periventricular thalamic nucleus, nucleus of the tuberculum posterior, and the subpretectal tegmentum, as well as in the pineal organ. At midbrain levels, retrogradely labeled cells were seen in the ipsilateral torus semicircularis, the contralateral OT, and bilaterally in the mesencephalic reticular formation and inside the limits of the retinopetal nuclei. In the hindbrain, tectal projecting cells were also bilaterally labeled in the dorsal and lateral isthmic nuclei, the octavolateral area, the sensory nucleus of the descending trigeminal tract, the dorsal column nucleus and the reticular formation. The rostral spinal cord also exhibited a few labeled cells. These results demonstrate a complex pattern of connections in the lamprey OT, most of which have been reported in other vertebrates. Hence, the lamprey OT receives a large number of nonvisual afferents from all major brain areas, and so is involved in information processing from different somatic sensory modalities.

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A comparative study of spinal projections to the brain (except cerebellum) in three classes of poikilothermic vertebrates

Cited by 82 publications

References 16 publications

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

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

Allometric Scaling of the Optic Tectum in Cartilaginous Fishes

Afferent Connections of the Optic Tectum in Lampreys: An Experimental Study

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