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Kazimierz Telesfor Kostanecki (1863-1940) remains one of the most important figures in the history of Polish medicine and natural science. He was the creator of one of the biggest scientific schools on Polish soil, a researcher versatile, working in parallel on many fields of natural science exploration. In his view, anatomy has become a dynamic and comprehensive science, that combines what today belongs to histology, cytology and embryology. Kostanecki has created an universal model of research, referring to comparative methods and based on planned series of experimental studies, especially when it came to issues related to developmental anatomy and mechanics of fertilization. This model was used and developed by his students and followers. It is not surprising, therefore, that the name Kostanecki has been repeatedly reported in the world literature, and a number of phenomena and facts established by him has kept its value, which comes obviouswhen we still can find citations of Polish scholar works in the contemporary monographs and articles.