Reference for Chullin 185:26

ואמר רב יהודה

The veins in the spleen, in the loins and in the kidneys are forbidden on account of fat; those in the fore-limb and in the cheeks on account of blood.<span class="x" onmousemove="('comment',' The arteries of the neck, i.e., the carotid arteries, are certainly forbidden because of their blood; here however only the minor veins are reckoned.');">¹¹</span>

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