Limits...
The claustrum of the bottlenose dolphin Tursiops truncatus (Montagu 1821).

Cozzi B, Roncon G, Granato A, Giurisato M, Castagna M, Peruffo A, Panin M, Ballarin C, Montelli S, Pirone A - Front Syst Neurosci (2014)

Bottom Line: We observed a strong presence of CR-immunoreactive (-ir) neurons and fibers, a diffuse but weak expression of CB-ir elements and virtually no PV immunostaining.NPY- and somatostatin-containing neurons were evident, while the potential claustral markers Gng2 was not identified in the sections, but no explanation for its absence is currently available.Although no data are available on the projections to and from the claustrum in cetaceans, our results suggest that its neurochemical organization is compatible with the presence of noteworthy cortical inputs and outputs and a persistent role in the general processing of the relative information.

View Article: PubMed Central - PubMed

Affiliation: Department of Comparative Biomedicine and Food Science, University of Padova Legnaro, Italy.

ABSTRACT
The mammalian claustrum is involved in processing sensory information from the environment. The claustrum is reciprocally connected to the visual cortex and these projections, at least in carnivores, display a clear retinotopic distribution. The visual cortex of dolphins occupies a position strikingly different from that of land mammals. Whether the reshaping of the functional areas of the cortex of cetaceans involves also modifications of the claustral projections remains hitherto unanswered. The present topographic and immunohistochemical study is based on the brains of eight bottlenose dolphins and a wide array of antisera against: calcium-binding proteins (CBPs) parvalbumin (PV), calretinin (CR), and calbindin (CB); somatostatin (SOM); neuropeptide Y (NPY); and the potential claustral marker Gng2. Our observations confirmed the general topography of the mammalian claustrum also in the bottlenose dolphin, although (a) the reduction of the piriform lobe modifies the ventral relationships of the claustrum with the cortex, and (b) the rotation of the telencephalon along the transverse axis, accompanied by the reduction of the antero-posterior length of the brain, apparently moves the claustrum more rostrally. We observed a strong presence of CR-immunoreactive (-ir) neurons and fibers, a diffuse but weak expression of CB-ir elements and virtually no PV immunostaining. This latter finding agrees with studies that report that PV-ir elements are rare in the visual cortex of the same species. NPY- and somatostatin-containing neurons were evident, while the potential claustral markers Gng2 was not identified in the sections, but no explanation for its absence is currently available. Although no data are available on the projections to and from the claustrum in cetaceans, our results suggest that its neurochemical organization is compatible with the presence of noteworthy cortical inputs and outputs and a persistent role in the general processing of the relative information.

No MeSH data available.


Related in: MedlinePlus

CB-ir neurons in the claustrum.(A–C) Immunoreactive neurons in paraffin-embedded sections. Scale bars etc.
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Figure 3: CB-ir neurons in the claustrum.(A–C) Immunoreactive neurons in paraffin-embedded sections. Scale bars etc.

Mentions: The examined sections showed a diffuse but weak expression of CB-ir elements (Figures 3A–C). The few positive elements displayed a small (approx. 10 μm) mono- or bipolar soma. Positive fibers were evident throughout the claustrum.


The claustrum of the bottlenose dolphin Tursiops truncatus (Montagu 1821).

Cozzi B, Roncon G, Granato A, Giurisato M, Castagna M, Peruffo A, Panin M, Ballarin C, Montelli S, Pirone A - Front Syst Neurosci (2014)

CB-ir neurons in the claustrum.(A–C) Immunoreactive neurons in paraffin-embedded sections. Scale bars etc.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3975097&req=5

Figure 3: CB-ir neurons in the claustrum.(A–C) Immunoreactive neurons in paraffin-embedded sections. Scale bars etc.
Mentions: The examined sections showed a diffuse but weak expression of CB-ir elements (Figures 3A–C). The few positive elements displayed a small (approx. 10 μm) mono- or bipolar soma. Positive fibers were evident throughout the claustrum.

Bottom Line: We observed a strong presence of CR-immunoreactive (-ir) neurons and fibers, a diffuse but weak expression of CB-ir elements and virtually no PV immunostaining.NPY- and somatostatin-containing neurons were evident, while the potential claustral markers Gng2 was not identified in the sections, but no explanation for its absence is currently available.Although no data are available on the projections to and from the claustrum in cetaceans, our results suggest that its neurochemical organization is compatible with the presence of noteworthy cortical inputs and outputs and a persistent role in the general processing of the relative information.

View Article: PubMed Central - PubMed

Affiliation: Department of Comparative Biomedicine and Food Science, University of Padova Legnaro, Italy.

ABSTRACT
The mammalian claustrum is involved in processing sensory information from the environment. The claustrum is reciprocally connected to the visual cortex and these projections, at least in carnivores, display a clear retinotopic distribution. The visual cortex of dolphins occupies a position strikingly different from that of land mammals. Whether the reshaping of the functional areas of the cortex of cetaceans involves also modifications of the claustral projections remains hitherto unanswered. The present topographic and immunohistochemical study is based on the brains of eight bottlenose dolphins and a wide array of antisera against: calcium-binding proteins (CBPs) parvalbumin (PV), calretinin (CR), and calbindin (CB); somatostatin (SOM); neuropeptide Y (NPY); and the potential claustral marker Gng2. Our observations confirmed the general topography of the mammalian claustrum also in the bottlenose dolphin, although (a) the reduction of the piriform lobe modifies the ventral relationships of the claustrum with the cortex, and (b) the rotation of the telencephalon along the transverse axis, accompanied by the reduction of the antero-posterior length of the brain, apparently moves the claustrum more rostrally. We observed a strong presence of CR-immunoreactive (-ir) neurons and fibers, a diffuse but weak expression of CB-ir elements and virtually no PV immunostaining. This latter finding agrees with studies that report that PV-ir elements are rare in the visual cortex of the same species. NPY- and somatostatin-containing neurons were evident, while the potential claustral markers Gng2 was not identified in the sections, but no explanation for its absence is currently available. Although no data are available on the projections to and from the claustrum in cetaceans, our results suggest that its neurochemical organization is compatible with the presence of noteworthy cortical inputs and outputs and a persistent role in the general processing of the relative information.

No MeSH data available.


Related in: MedlinePlus