By Heinz Stephan, Georg Baron, Heiko D. Frahm
This first quantity within the sequence on "Comparative mind learn in Mammals" offers with the brains of Insectivora. the significance of Insectivora lies primarily within the indisputable fact that, (1) insectivore-like ancestors are considered as the preliminary workforce for the evolution of upper mammals, and (2) the insectivore brains retained many conservative features, although the animals have tailored to various residing environments. consequently, the learn of Insectivora brains allows an perception into the scale and composition of the mind constitution of past ancestors of the better mammals together with primates and people; moreover, it illumi nates many of the evolutionary developments which made the winning edition to diversified biotopes attainable. The adjustments which the mind has skilled through the phylo geny and the comparable adaptive radiation could be tested within the succeeding volumes at the brains of alternative Eutheria, e.g., bats (Volume 2) and primates (Volume 4). In quantity three the brains of marsupials may be in comparison with these of conservative and developed Eutheria.
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Additional info for Insectivora: With a Stereotaxic Atlas of the Hedgehog Brain
Delimitation may become even more difficult when the cortices are reduced, as in the case of the olfactory cortices of water-adapted species. 9%). Since, however, the volume measurements for GeogaZe are based on poor material, they may be unreliable and the derived volumes, percentages, and indices must be interpreted with caution. 7% in DIE). 6). Most of the components discussed here are composed of a variety of nuclear complexes, nuclei, and fiber bundles or, in cortices, of regions, areas, and laminae.
Percentages are therefore less useful for evaluating interspecific or intergroup differences (see also Material and Methods). 71% brain relative to body weight. 36%). The difference is due to the great number of shrews in the species average (27 out of 53). All the small-bodied shrews had high percentages of BrW to BoW (Tables 6 and 7). Encephalization Indices: To minimize the differences in relative brain size within narrowly related groups, and to arrive at a well founded base to evaluate the differences between groups, detailed analyses were carried out using the canonical method as described by Rempe (1970).
In Tenrecidae, the Geogalinae were the lowest, followed in ascending order by Tenrecinae, Oryzorictinae, and Potamogalinae. In Soricidae, the Soricinae had on the average somewhat higher Els than the Crocidurinae; in Talpidae, the Desmaninae were clearly higher than the Talpinae, and, in Erinaceidae, the Echinosoricinae were much higher than the Erinaceinae (Table 7). Similar results were obtained when the net volumes of the total brains were compared. , ventricles, meningeal membranes and nerves were excluded (Table 8).
Insectivora: With a Stereotaxic Atlas of the Hedgehog Brain by Heinz Stephan, Georg Baron, Heiko D. Frahm