Although his anatomical experiments on animal models led him to a more complete understanding of the circulatory system, nervous system, respiratory system, and other structures, his work contained scientific errors.
Meskipun eksperimen anatomi pada model hewan membawanya ke pemahaman sistem peredaran darah yang lebih komprehensif, sistem saraf, sistem pernapasan, dan struktur lainnya, tetapi karyanya berisi kesalahan ilmiah.