Reference for Chullin 151:34

דעילוי ערקומא

said: Where the tendons bulge it is part of the juncture, but not where they are sunken in; where they are hard it is part of the juncture but not where they are soft; where they are large it is part of t juncture but not where they are small; where they are white it is part of the juncture but not where they are not white.

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