Reference for Chullin 151:31

רבה בר רב הונא אמר רב אשי

And how far does it extend? - A certain Rabbi, whose name was R'Jacob, said: When I was at the school of Rab Judah, he said to us: Accept from me the following ruling which I heard from a great man, that is Samuel, viz. , The juncture of the tendons of which they spoke is the place where the tendons converge, and it extends from the place where the tendons converge up to the place where they part.

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