In De fabrica, he corrected an earlier claim he made in Tabulae about the right kidney being set higher than the left. Vesalius claimed that the kidneys were not a filter device for urine to pass through, but rather that the kidneys serve to filter blood as well, and that excretions from the kidneys travelled through the ureters to the bladder. He described the omentum, and its connections with the stomach, the spleen and the colon gave the first correct views of the structure of the pylorus. He also observed the small size of the caecal appendix in man and gave the first good account of the mediastinum and pleura. Vesalius admitted that due to a lack of pregnant cadavers he was unable to come to a significant understanding of the reproductive organs. However, he did find that the uterus had been falsely identified as having two distinct sections.
In De fabrica, he corrected an earlier claim he made in Tabulae about the right kidney being set higher than the left. Vesalius claimed that the kidneys were not a filter device for urine to pass through, but rather that the kidneys serve to filter blood as well, and that excretions from the kidneys travelled through the ureters to the bladder. He described the omentum, and its connections with the stomach, the spleen and the colon gave the first correct views of the structure of the pylorus. He also observed the small size of the caecal appendix in man and gave the first good account of the mediastinum and pleura. Vesalius admitted that due to a lack of pregnant cadavers he was unable to come to a significant understanding of the reproductive organs. ,However he did find that the uterus had been falsely identified as having two distinct sections.