We still have a very poor understanding of the body. We're still discovering organs we didn't know we had: https://theoutline.com/post/851/scientists-identify-n

We still have a very poor understanding of the body. We're still discovering organs we didn't know we had: https://theoutline.com/post/851/scientists-identify-new-organ-in-the-human-body https://theoutline.com/post/851/scientists-identify-new-orga... It's entirely plausible to me that this has gone unnoticed for 200 years.