Maimonides Commentary on Mishaynot Sotah Chap 9 Mishna 4
Textual Variation: Debate is between navel and nose.
Maimonides Commentary on Mishnayot Yoma Chap 8 Mishna 5
Genesis Chap 2 Verse 7
Source of life is breathing.
Bet Yosef Orach Chayim 329
Textual Varation: It has navel instead of heart.
Tractate Niddah 69b
Moreh Nevuchim Vol I 42
Mishana Yevamot Chap 16 Mishna 3
Mishna Sota Chap 9 Mishna 4
Here is a debate between navel and nose.