Part 13 · Chapter 26

And it has already been explained above that they are explained there from below upward, and they are: the first head is the concealed Hochma in AA, which is within his Keter. And above it is Atik Yomin; therefore it said of it "the upper head," because it is higher than the aforementioned others, and it is the Keter of AA, called his skull. And above them all is the head of all heads.