Good question: Basically we often don't know. Every embryonic fetus has potential to develop 2 kidneys. All mammals have fetal metanephric nephric cells which divide thousands of times 2 develop into kidneys. Additionally iny "buds" develop on either side of developing fetal bladder, these buds lengthen & fuse with metanephric cells exactly in their center. Failure of any stage can result in no kidney that side.
Answered 4/22/2018
5.1k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question