The Pallium of Anuran Amphibians

Neary, Timothy J.

doi:10.1007/978-1-4757-9622-3_4

Cited by 86 publications

(130 citation statements)

References 66 publications

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“…Some authors [e.g. Neary, 1990] consider the dorsal part of the lateral pallium to be the dorsal pallium, and, therefore, they describe the olfactory projections to reach the dorsal pallium also. It seems possible that the medial olfactory tract in amphibians includes the medial and intermediate olfactory tracts of reptiles.…”

Section: Olfactory Projectionmentioning

confidence: 99%

“…Studies in more species are needed to determine whether this difference between lizards and snakes is a consistent feature. Northcutt and Royce, 1975;Neary, 1990; Rana esculenta, Kemali and Guglielmotti, 1987;Rana pipiens, Scalia et al, 1991]. The overall pattern described consists of a lateral olfactory tract that projects bilaterally to the lateral pallium (and the cortical amygdala), crossing the midline through the habenular commisssure, and a medial olfactory tract that reaches the medial pallium, the rostral septum and the postolfactory eminence.…”

Section: Olfactory Projectionmentioning

confidence: 99%

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Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake <i>Thamnophis sirtalis</i>

Lanuza¹,

Halpern²

1997

Brain Behav Evol

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This study reinvestigates the efferent projections of the main and accessory olfactory bulbs and describes for the first time the centrifugal projections to the main and accessory olfactory bulbs in the snake Thamnophis sirtalis, using the intraaxonal transport of the anterograde and retrograde tracer biotinylated dextran amine and the retrograde tracer horseradish peroxidase. The olfactory projection consists of three tracts: the lateral olfactory tract, which projects bilaterally to the lateral cortex and the rostral amygdala, crossing the midline through the stria medullaris-habenular commissure system; the intermediate olfactory tract, which projects ipsilaterally to the olfactory tubercle and contributes to the contralateral projection; and the medial olfactory tract, which projects ipsilaterally to the dorsomedial retrobulbar formation. The vomeronasal projection is formed by a single tract, the accessory olfactory tract, that projects ipsilaterally to the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus. The centrifugal projections to the main and accessory olfactory bulb are composed of two components: one that arises in areas that receive the olfactory or vomeronasal input (neurons in the olfactory tubercle, retrobulbar formation and lateral cortex project to the main olfactory bulb; and neurons in the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus project to the accessory olfactory bulb), and another that arises in areas not directly implicated in processing the chemosensory information (the nucleus of the diagonal band of Broca and the dorsal cortex). These data allow the recognition of the general pattern of organization of the reptilian olfactory and vomeronasal systems.

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Section: Olfactory Projectionmentioning

confidence: 99%

Section: Olfactory Projectionmentioning

confidence: 99%

Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake <i>Thamnophis sirtalis</i>

Lanuza¹,

Halpern²

1997

Brain Behav Evol

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“…Another circumstance that would support the homology of Dmv with the pallial amygdala is its topological situation. The Dmv telencephalon is located between the ventral subpallial area (possible striated region) and the dorsoposterior area (main olfactory receptor area), a similar position to the pallial amygdala of other vertebrates, between the olfactory cortex and the subpallial amygdala (Braford, 1995;Bruce & Neary, 1995;Neary, 1990;Neary & Bruce, 1993;Northcutt & Kicliter, 1980). Other authors have pointed to the region VsThe Amygdala -A Discrete Multitasking Manager 4 pVv (ventral area supracomisural ventral-ventral area) as homologous to the corticomedial amygdala, based on the fact that it receives olfactory afferents (Oka, 1980), the concentration of steroid hormone receptors (Kim et al, 1978;see Medina et al, 2011 for a review of steroid hormone-regulated as a component of the amygdala), and the results of electrolytic lesions .…”

Section: The Amygdala Homologies Among Vertebratesmentioning

confidence: 99%

Amygdala and Emotional Learning in Vertebrates – A Comparative Perspective

Vargas¹,

López²,

Portavella³

2012

The Amygdala - A Discrete Multitasking Manager

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“…zone, there being little cell migration away from the latter. Thalamic sensory projections terminate mostly in the medial pallium and in the corpus striatum (5). The brains of reptiles have a small, three-layered cerebral cortex consisting of a medial part and a dorsomedial part, both of which make up the homologue of the hippocampal formation of mammals; a lateral part which corresponds to the olfactory cortex of mammals, and a very small dorsal cortex, which is possibly homologue to the isocortex.…”

Section: Introductionmentioning

confidence: 99%

Critical steps in the early evolution of the isocortex: Insights from developmental biology

Aboitiz

Montiel

López

2002

Braz J Med Biol Res

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This article proposes a comprehensive view of the origin of the mammalian brain. We discuss i) from which region in the brain of a reptilian-like ancestor did the isocortex originate, and ii) the origin of the multilayered structure of the isocortex from a simple-layered structure like that observed in the cortex of present-day reptiles. Regarding question i there have been two alternative hypotheses, one suggesting that most or all the isocortex originated from the dorsal pallium, and the other suggesting that part of the isocortex originated from a ventral pallial component. The latter implies that a massive tangential migration of cells from the ventral pallium to the dorsal pallium takes place in isocortical development, something that has not been shown. Question ii refers to the origin of the six-layered isocortex from a primitive three-layered cortex. It is argued that the superficial isocortical layers can be considered to be an evolutionary acquisition of the mammalian brain, since no equivalent structures can be found in the reptilian brain. Furthermore, a characteristic of the isocortex is that it develops according to an inside-out neurogenetic gradient, in which late-produced cells migrate past layers of early-produced cells. It is proposed that the inside-out neurogenetic gradient was partly achieved by the activation of a signaling pathway associated with the Cdk5 kinase and its activator p35, while an extracellular protein called reelin (secreted in the marginal zone during development) may have prevented migrating cells from penetrating into the developing marginal zone (future layer I).

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The Pallium of Anuran Amphibians

Cited by 86 publications

References 66 publications

Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake <i>Thamnophis sirtalis</i>

Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake <i>Thamnophis sirtalis</i>

Amygdala and Emotional Learning in Vertebrates – A Comparative Perspective

Critical steps in the early evolution of the isocortex: Insights from developmental biology

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