Insectivora: With a Stereotaxic Atlas of the Hedgehog Brain by Heinz Stephan, Georg Baron, Heiko D. Frahm

By Heinz Stephan, Georg Baron, Heiko D. Frahm

This first quantity within the sequence on "Comparative mind examine in Mammals" offers with the brains of Insectivora. the significance of Insectivora lies certainly within the undeniable fact that, (1) insectivore-like ancestors are considered as the preliminary crew for the evolution of upper mammals, and (2) the insectivore brains retained many conservative features, even though the animals have tailored to diverse residing environments. for this reason, the research of Insectivora brains permits an perception into the scale and composition of the mind constitution of past ancestors of the better mammals together with primates and people; furthermore, it illumi­ nates a few of the evolutionary developments which made the winning edition to diverse biotopes attainable. The changes which the mind has skilled during the phylo­ geny and the comparable adaptive radiation should 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 can be in comparison with these of conservative and advanced Eutheria.

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Insectivora: With a Stereotaxic Atlas of the Hedgehog Brain

This primary quantity within the sequence on "Comparative mind learn in Mammals" offers with the brains of Insectivora. the significance of Insectivora lies peculiarly within the undeniable 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 characteristics, notwithstanding the animals have tailored to assorted dwelling environments.

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4 - 15), left side (Figs. 16 - 27), ventral (Figs. 28 - 39), and midsagittal reconstructions (Figs. 40 - 51). Abbreviations for Figs. 40 - 51 are given on p. 43. Linear enlargement as indicated. 5 em Figure 39 Suneus etruseus Macromorphology 43 Figures 40 - 51 (on the following pages): Midsagittal reconstructions. The ventricular system is diagonally hatched; the surface of the cerebral hemispheres adjacent to the midsagittal plane is marked by dots; cerebral commissures and optic chiasma including the supraoptic commissures are dark.

52). The size indices for OBL may be described as follows: Averages: 132 in the 50 species, 139 in the twelve subfamilies and families. This was the lowest level reached of the five fundamental brain parts. Range: 86 - 240. 8 times larger than the lowest (Tenrec); this is relatively narrow variation. Small size: Tenrecinae (100), Erinaceinae (102), Chrysochloridae (105). Large size: Limnogale (216), Potamogalinae (207), Galemys (203). 0 o a o SOLENODONTIDAE 'J .. 0 Figure 54 250 -POTAMOGALINAE 200 t

All species of Talpinae were above this average; Chrysochloridae, Potamogalinae and Oryzorictinae averaged on or somewhat above the AvIF but contain some species below the average. In Potamogalinae, the NET indices were reduced by a strong decrease in the olfactory structures. Clearly below the subfamily average were Crocidurinae and Erinaceinae. Some species of the Crocidurinae were as low as the Tenrecinae. A still lower position than in Tenrecinae was found in Geogale. The differences in the relative brain size of the various taxonomic units, as shown in Fig.

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