Midrash for Chullin 268:44
הזרוע המיומן שבזרוע
means the right thigh, so 'The shoulder' means the right shoulder.
Sifrei Devarim
"the shoulder": the right shoulder.
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Talmud Bavli
הזרוע המיומן שבזרוע
means the right thigh, so 'The shoulder' means the right shoulder.