I'm still working through the kidney topic, and I am across a lengthy discussion by R. Yehudah Muscato (Italy c.1530- c.1593), an interesting figure who learned from both R. Azariah DeRossi as well as R. Moshe Provencal. Unfortunately I don't entirely understand what he is saying! Here is the link; it begins five lines from the bottom on the right column. In particular, I don't understand what he means exactly with his references to kochos and ruchos . If anyone can translate/ explain it, I would appreciate it!