Reference for Chullin 38:37

השוחט מן העורף שחיטתו פסולה המולק מן העורף מליקתו כשירה

but not the actual back of the head! - THE BACK OF THE NECK really means [the region] close to the back of the neck, and this is indicated in the subsequent clause which reads: FOR THE WHOLE OF THE BACK OF THE NECK IS THE APPROPRIATE PLACE FOR NIPPING.<span class="x" onmousemove="('comment',' In this clause THE BACK OF THE NECK cannot mean the second cervic vertebra for one could not reasonably refer to it in such terms as: THE WHOLE OF THE BACK OF THE NECK. It must mean, therefore, the whole region close to and in front of the back of the neck.');">¹⁵</span>

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