The brains of the cattle fetuses in the age from 8 weeks until 29^th week and the brain of a newborn were collected for the study. The development of gyrus dentatus in specific stages of fetal life was described. The greatest changes were observed in the 20^th week of life. In this period a layer of granular cells is being developed. A layer of multi-form cells is also visible. Molecular layer, which is clearly separating itself at this stage, contains scarcely placed nerve cells. In the third trimester of pregnancy, the layer of granular cells contains neurons of the oval and fusiform cells. It was observed that gyrus dentatus in cattle fetuses starts to display structural differentiation in the 14^th week of pregnancy. In the fetal life of cattle a parallel development of gyrus dentatus in relation to Ammon’s horn was observed.

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