Idra Raba
Beard Brain Flow Hair Head Zeir Anpin

26. Each individual strand of hair has a wellspring that emanates from a concealed brain, THAT IS THE THIRD HEAD OF ARICH ANPIN. It glows and flows from these strands to the strands of Zeir Anpin, and the brain OF ZEIR ANPIN is constructed from these, MEANING IT RECEIVES THE FIRST THREE SFIROT. Then the brain OF ZEIR ANPIN flows to the 32 paths OF CHOCHMAH.

26. וּבְכָל נִימָא וְנִימָא, אִית מַבּוּעָ דְּנָפִק מִמּוֹחָא סְתִימָאָה, וְנָהִיר וְנָגִיד בְּהַהוּא נִימָא, לְנִימִין דִּזְעֵיר אַנְפִּין. וּמֵהַאי מִתְקַּן מוֹחֵיהּ. וּכְדֵין, נָגִיד הַהוּא מוֹחָא, לִתְלָּתִין וּתְרֵין שְׁבִילִין.