Midrash for Chullin 268:38
אתה אומר זה זרוע ימין או אינו אלא זרוע שמאל
FROM THE JOINT OF THE JAW TO THE PROMINENCE OF THE WINDPIPE.<span class="x" onmousemove="('comment',' I.e., the tip of the thyroid cartilage. This extent includes the whole of the lower jaw and the tongue. gurzv');"><sup>26</sup></span>
Sifrei Devarim
"the shoulder": the right shoulder.
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