The examination was carried out on 5 brains of sexually nature in the polar fox (Alopex lagopus). The material of the examination after fixing, dehydrating ,embedding in paraffin and cutting was coloured according to Klüver and Barrer`s method. Gyrus parahippocampalis which was the object of examination is a cortical structure which joins formation hippocampus with neocortex. It is a rear part of gyrus fornicatus which stretches from splenium of corpus callosum to the abdomino- medial angle of cerebral hemisphere. It is` made up of the following cortical structures: area entorhinalis, parasubiculum and presubiculum. The above mentioned parts of gyrus parahippocampalis` cortex are made up of four layers: marginal, cellular I, cellular II, and cellular III.

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