A Pallial Visual Area in the Telencephalon of the Bony Fish &lt;i&gt;Polypterus&lt;/i&gt;

Northcutt, R. Glenn; Plassmann, Wolfgang; Holmes, Preston H.; Saidel, William M.

doi:10.1159/000077538

Cited by 28 publications

(30 citation statements)

References 25 publications

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“…Reciprocal experiments involving injections of DiI or biotinylated dextran amine (BDA) into Vd or the thalamus of bichirs (Holmes 2001) confirm that Vd and thalamic nuclei do project to nucleus medianus. In addition, similar injections of BDA into the optic tectum of bichirs confirm that each lobe of the optic tectum projects bilaterally onto nucleus medianus (Northcutt et al 2004). Comparable reciprocal experiments have not been performed for the hypothalamus and the lateral toral nucleus.…”

Section: Connections Of Nucleus Medianusmentioning

confidence: 90%

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Phylogeny of nucleus medianus of the posterior tubercle in rayfinned fishes

Northcutt

2009

Integrative Zoology

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The brains of ray-finned fishes form a morphocline of increasing complexity, from cladistians through teleosts. This is particularly apparent in the posterior tubercle of the diencephalon. In cladistians, the posterior tubercle consists of a periventricular nucleus and a migrated nucleus medianus that is fused across the midline. In more advanced ray-finned fishes, such as gars and bowfins, the posterior tubercle comprises numerous additional migrated nuclei, termed the preglomerular complex, in addition to a more well developed nucleus medianus. In teleosts, the most derived ray-finned fishes, there is an even more elaborate preglomerular complex, but there is no recognizable nucleus medianus. In an attempt to explain the variation in the posterior tubercle of the diencephalon in ray-finned fishes, the immunohistochemistry and connections of nucleus medianus were examined in cladistians, gars and bowfins. In each of these taxa, nucleus medianus exhibits large numbers of calretinin-positive neurons and has ascending projections that terminate in several divisions of the pallium. Although teleosts, such as goldfish, also exhibit numerous cell groups in the posterior tubercle that are rich in calretinin, none of these cell groups has connections that are comparable to those of nucleus medianus in non-teleost ray-finned fishes. It is possible, therefore, that nucleus medianus was lost with the origin of teleosts.

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Section: Connections Of Nucleus Medianusmentioning

confidence: 90%

“…The latter fuses across the midline of the midbrain tegmentum ( Fig. 2A) and receives an extensive input from the optic tectum (Northcutt et al 2004). Furthermore, it projects to the dorsomedial pallium (Holmes & Northcutt 2003, and Fig.…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of nucleus medianus of the posterior tubercle in rayfinned fishes

Northcutt

2009

Integrative Zoology

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“…In contrast, in Polypterus , where neither proliferation nor migration occurs, pallial organization differs considerably from that in all other ray-finned fishes. Despite these differences, zones homologous to the posterior (Dp) and lateral (Dl) zones in teleosts have been proposed [Reiner and Northcutt, 1992;Holmes and Northcutt, 2003;Northcutt et al, 2004]. It appears, however, that this species lacks cell groups homologous to the central (Dc), dorsal (Dd), and medial (Dm) zones of the pallium in other ray-finned fishes.…”

Section: Comparisons With Other Actinopterygiansmentioning

confidence: 99%

Immunohistochemical Organization of the Forebrain in the White Sturgeon, <i>Acipenser transmontanus</i>

Piñuela

Northcutt

2007

Brain Behav Evol

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The distribution of substance P (SP), leucine-enkephalin (LENK), serotonin (5HT), dopamine (DA), and tyrosine hydroxylase (TH) was examined in the forebrain of the white sturgeon in order to evaluate several anatomical hypotheses based on cytoarchitectonics, and to gain a better understanding of the evolution of the forebrain in ray-finned fishes. The subpallium of the telencephalon has the highest concentration of the neuropeptides SP and LENK, allowing the pallial-subpallial border to be easily distinguished. The distribution of dopamine is similar to that of serotonin in the subpallium, fibers positive for these transmitters are particularly dense in the dorsal and ventral divisions of the subpallium. In addition, a small population of DA- and 5HT-positive cell bodies – which appear to be unique to sturgeons – was identified at the level of the anterior commissure. The internal granular layer of the olfactory bulbs had large numbers of TH-positive cell bodies and fibers, as did the rostral subpallium. The occurrence of cell bodies positive for LENK in the dorsal nucleus of the rostral subpallium supports the hypothesis that this nucleus is homologous to the striatum in other vertebrates. This is further reinforced by the apparent origin of an ascending dopaminergic pathway from cells in the posterior tubercle that are likely homologous to the ventral tegmental area/substantia nigra in land vertebrates. Finally, the differential distribution of SP and TH in the pallium supports the hypothesis that the pallium, or area dorsalis, can be divided medially into a rostral division (Dm), a caudal division (Dp) that is the main pallial target of secondary olfactory projections, and a narrow lateral division (Dd+Dl) immediately adjacent to the attachment of the tela choroidea along the entire rostrocaudal length of the telencephalic hemisphere.

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“…Although the ventromedial nucleus consists of small periventricular cells, the ventrolateral nucleus has large cells migrated laterally [Schlussman et al, 1990]. In teleosts, most of the labeled cells were in the ipsilateral ventromedial thalamic nucleus, but some were also observed in the ventrolateral thalamic nucleus [Braford and Northcutt, 1981;Northcutt, 1982;Northcutt et al, 2004;Xue et al, 2006]. In amphibians, cell populations located in a similar position also project to the OT [Trachtenberg and Ingle, 1974], and receive direct projections from the retina [Scalia and Gregory, 1970;Fite et al, 1977].…”

Section: Diencephalic Projectionsmentioning

confidence: 99%

“…In addition, thalamic cells located in similar positions and projecting to the OT were also identified in chondrichthyans [Smeets, 1982] and actinopterygian fishes [Braford and Northcutt, 1981;Grover and Sharma, 1981;Northcutt, 1982;Schlussman et al, 1990;Yamamoto et al, 1999;Northcutt et al, 2004].…”

Section: Diencephalic 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 Pallial Visual Area in the Telencephalon of the Bony Fish <i>Polypterus</i>

Cited by 28 publications

References 25 publications

Phylogeny of nucleus medianus of the posterior tubercle in rayfinned fishes

Phylogeny of nucleus medianus of the posterior tubercle in rayfinned fishes

Immunohistochemical Organization of the Forebrain in the White Sturgeon, <i>Acipenser transmontanus</i>

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

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