Reference for Chullin 96:36

האי הדורא דכנתא דאינקיב להדי חבריה מגין עליה

of the needle is outside [the liver it is trefah, it must have pierced [the internal organs] and entered; but if the head is inside [it is permitted, for] it must have entered via the vein!<span class="x" onmousemove="('comment',' Probably the ductus choledocus. The needle in all probability passed down into the alimentary passage, into the intestines, and thence into the liver via this duct, without piercing any organ. V. Katzenelsohn, pp. 180-183.');">¹⁴</span>

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