Reference for Chullin 56:13

למימרא דטעמא דרבי יהודה משום דם הוא

THROUGH THE JUGULAR VEINS? - Say: He must pierce<span class="x" onmousemove="('comment',' With any instrument and not necessarily the slaughtering knife; the sole purpose being to allow the blood to flow.');">⁷</span>

Jastrow