Originally Posted by jacky528
Yes, I am talking about the white arcs,
and it’s like the central storage tissue in our body.
I know it may sound a little unscientific to you, but this is not only the guessing of me,
it is also said on some books, internet.
And now I know, that thing is called lunula.
You can have it a search on google.
Can you link me to one of these site?