Reference for Chullin 268:65

לא קשיא הא רבנן והא רבי חנינא בן אנטיגנוס דתניא

But it has been taught: One should cut it away and the place of slaughtering should go with it!<span class="x" onmousemove="('comment',' This apparently implies that a part of the area prescribed for slaughtering must be included in 'the cheek'. This however is not the case according to the description of 'the cheek' in our Mishnah, for the tip of the thyroid cartilage, which is the limit described in the Mishnah, is surely not within the area prescribed for slaughtering.');">⁴²</span>

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