Ari Enkin, Translation:Shulchan Aruch/Yoreh Deah…
“ We follow the Rashba who rules that the hair is not considered a problem for the purposes of salting. The cutting stated here is for those who want to be more meticulous, however the halacha does not require it for the head is as any other thick piece of meat. Regarding the brain, it suffices to make a hole in the bottom of the skull to allow the blood to flow out. ”
