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Our mishna states: If the membrane of the brain was perforated, the animal is a tereifa. The Gemara cites Rav and Shmuel, who both say: The brain is covered by two membranes, a thick outer membrane adjacent to the skull and a thin inner membrane adjacent to the brain. The animal is a tereifa if the outer membrane was perforated, even if the inner membrane was not perforated.
And some say that the animal is not a tereifa unless the innermembrane was perforated as well. Rabbi Shmuel bar Naḥmani says: And this is your mnemonic to remember the halakha: The bag in which the brain rests, i.e., the inner membrane.
We explore notions of meninges skull and pathology in the Talmud and Antiquity.