Reference for Chullin 111:15

אי איתא דאינקיב עילאה תתאה אגב רוככיה מיפקע פקע

- If it were so, that the upper membrane had been pierced, then the lower on account of its tenderness would most certainly break<span class="x" onmousemove="('comment',' One may therefore be certain that if nothing of the brain substance exudes the upper membrane has not been pierced.');">¹⁰</span>

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