一切經音義 2.34

2.34

腦膜（上乃倒反說文作腦頭中髓從肉[甾-十+乂]聲有作𮌢或作𦠊或作腦並非也[甾-十+乂]音與上同下音莫字統云在皮內肉外曰膜說文云肉間胲膜也胲音古哀反也）。

Brain and membranes (腦膜: the upper character is nai + dao fan. The Shuowen jiezi writes it as 𦠒: the marrow in the head; it takes the flesh signific and zai phonetic. There are those who write it as 𮌢, 𦠊, or 腦, all of which are incorrect; [the phonetic component] has the same pronunciation as above. The lower character is pronounced mo. The Zitong says: what is inside the skin and outside the flesh is called a membrane. The Shuowen jiezi says: the intermuscular membranes between flesh. 胲 is gu + ai fan).