Volumetric analysis of pteropid brains

Stephan, Heinz; Pirlot, Paul; Schneider, R

doi:10.1159/000144169

Cited by 26 publications

(24 citation statements)

References 4 publications

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“…Frugivorous Phyllostomatidae are primarily acoustic animals. Even if their origins are somewhat obscure [Smith, 1976], there is general agreement among authors that they separated from insectivo rous Microchiroptera relatively recently [see, for instance, Stephan et al, 1974;Eisenberg and Wilson, 1978]. The development of the olfactory system of Phyllostomatids may be considered as a secondary adaptation to the exploitation of new feeding niches.…”

Section: Discussionmentioning

confidence: 99%

“…After a decade of quantitative investigations, the brain of Chiroptera is now known to vary widely with respect to its total size Ste phan, 1970: Stephan, 1977;Eisenberg and Wilson, 1978], to the relative importance of its major parts Stephan et al, 1974;Pirlot and Pottier, 1977], and to the development of several senso ry and motor nuclei [Baron, 1969[Baron, , 1970a[Baron, , b, 1974[Baron, , 1977a[Baron, , b, 1978Liitgemeier, 1962;Mann, I960]. In a recent publication [Baron and Joli coeur, 1980], the present authors attempted to provide, using multiple discriminant analysis, a synthetic description of detailed differences in brain structure among Chiroptera.…”

Section: Introductionmentioning

confidence: 99%

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Brain Center Correlations among Chiroptera

Jolicœur¹,

Baron²

1980

Brain Behav Evol

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Correlations between progression indices of five categories of nuclei and brain centers indicate that Megachiroptera rely primarily on vision and olfaction while Microchiroptera rely primarily on audition. Among Microchiroptera, some rely more heavily on olfaction than on vision as a secondary sense, and vice-versa. There may have been compensatory effects, in the course of evolution, regarding the choice of the primary and secondary information channels.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Brain Center Correlations among Chiroptera

Jolicœur¹,

Baron²

1980

Brain Behav Evol

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“…In the comparative analysis of the cortical differentiation in Inscctivora, Chiroptera and Primates the archicortex was considered together with the ncoand paleocortex. In this particular case the archicortex includes the schizocortex, and the volumetric data (white matter included) were derived from Stephan and Pirlot [1970] and Stephan et al [1974Stephan et al [ , 1981.…”

Section: Data Selectionmentioning

confidence: 99%

Size and Shape of the Cerebral Cortex in Mammals

1988

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The geometry of the brain and cerebral cortex in mammals has been studied from an evolutionary perspective and is described in mathematical terms. The volume of the cerebral cortex, in contrast to the cortical surface area, scales to brain volume in a similar way, irrespective of the degree of cortical folding. Among mammals, Cetacea form a subgroup, in that their volumetric data fit an isometric model better than an allometric model. An index of corticalization is presented which contains information about both the mass of interconnective nerve fibers and the degree of intracortical processing. It is shown, furthermore, that a semilogarithmic equation appropriately describes the relationship between mean cortical thickness and brain volume. Finally, allometric equations between brain volume and cortical parameters, which can be used for predictive purposes, are presented.

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“…The data on Megachiroptera (7 species) are from Stephan et al [1974], those on Microchiroptera (15 species) from Stephan and Pirlot [1970], and these on insectivores (28 species), strepsirhine (20 species), platyrrhine (13 species) and catarrhine (13 species) primates from Stephan et al [1981], The numbers in parentheses represent the total cerebral cortex as percent telencephalic volume; values for taxa other than manatees were derived from the above references and Frahm et al [1982] and are overestimates because they include the nucleus accumbens and the amygdala. Note that manatees have a well-developed telencephalon with a cerebral cortex comparable to that of primates and larger than that of insectivores and bats.…”

Section: Discussionmentioning

confidence: 99%

Regional Brain Morphometry and Lissencephaly in the Sirenia

Reep

O’Shea

1990

Brain Behav Evol

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Neuroanatomical structure was examined in the brains of West Indian manatees (Trichechus manatus) using computer-based morphometric methods. Although manatees have a small relative brain size, volume estimates of the major brain regions indicate that the telencephalon comprises 71% of totalbrain volume and is 90% cerebral cortex. These values are comparable to those seen among a diversity of taxa having large relative brain size, including many primates. Manatee brains also exhibit well-defined cortical lamination. The measured gyration index (an index of cortical folding) was 1.06, representing a highly lissencephalic condition. These findings demonstrate that small relative brain size and lissencephaly do not constrain the elaboration of internal brain structures. The marked lissencephalic condition is unusual for brains of this absolute size range, and may be related to the thickness of the cortical gray matter and underlying white matter.

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Volumetric analysis of pteropid brains

Cited by 26 publications

References 4 publications

Brain Center Correlations among Chiroptera

Brain Center Correlations among Chiroptera

Size and Shape of the Cerebral Cortex in Mammals

Regional Brain Morphometry and Lissencephaly in the Sirenia

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