Midrash for Chullin 268:33

ר' יהודה אומר

FROM THE JOINT UP TO THE SHOULDER-SOCKET OF THE FORELIMB;<span class="x" onmousemove="('comment',' I.e., from the carpus to the scapula; it thus consists of two bones, the radius and the humerus. V. Diagram of ox.');">²²</span>

Sifrei Devarim