Six heifers, aged 8-10 months, and 4 cows, aged 4-12 years, were used for studying the conformation of the cerebral ventricles on mouldings, and the topography on scanographs and frozen cuts. The morphologic changes with age concern the height of the 3rd ventricle, the extension of the pellucid septum and the stereotaxic topography. The stress is put on the variability of the volume of the lateral ventricles and the permanence of a vast and patent recessus olfactorius, with easy external landmarks.
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