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The brain morphology of microtus brandti radde 1861 and alticola argentatus semicanus allen 1924 rodentia cricetidae results of the mongolian german biological expeditions since 1962 number 189



The brain morphology of microtus brandti radde 1861 and alticola argentatus semicanus allen 1924 rodentia cricetidae results of the mongolian german biological expeditions since 1962 number 189



Zeitschrift fuer Mikroskopisch-Anatomische Forschung (Leipzig) 102(1): 71-88



The brains of both species of Mongolian rodents were compared using the external brain morphology including macroscopic measurements and Nissl stained coronal sections of corresponding brain regions. The somewhat different brain body weight ratios (Microtus brandti: 2.05%, Alticola argentatus semicanus: 1.55%, obtained from the brains fixed with formaldehyde) seem to be caused by allometric influences. Contrary to this, the brain shape and morphological details are typical characteristics of these closely related species or genera, probably useful for species diagnosis. Those differences can mainly be found in the morphology of the olfactory bulbs, the forebrain cortices and the cerebellar paraflocculi accessorii. The higher level of morphologic differentiation of the cerebellum in Alticola argentatus semicanus corresponds with the more developed climbing ability of this species. As expected, the brain of Microtus brandti is very similar to those of other species of the genus Microtus.

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