All of us have one and it can be more or less pronounced…it is where the different part of our face come together during development….the different puzzle which make up our face are formed and then come together and form the grove, this normally happens between 2 and 3 months in the womb….you can find a great video at the link below http://www.wimp.com/nosegroove/
My guess is that it is where the bone and tissue fuse in our heads as we develop. If you have heard of cleft lip and palate, this is what happens when this fusing doesn’t work properly
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