Patrick, glad to hear you seem satisified with your chiro visit. "Radiating" or "referring" pain is quite interesting, no? I once had a sinus infection that caused my lower teeth to hurt. Not the top ones...but the lower ones. The pain was "referred," according to my physician.
Trux, the sinuses located further back in the head (and which can be quite tricky to operate on, as one has to manuever around/through areas very near the brain) are called sphenoid sinuses. We have eight total sinus cavities (unless there exists an abnormality...in which case we can have more or fewer): maxillary, ethmoid, frontal, and sphenoid. Not only is the sphenoid more difficult to reach for treatment, it is also not very large. It is not EXACTLY in the "back of the skull," just further/deeper in the head than the others. Sorry if I misled you with my words. I can definitely tell you that having an infection in the sphenoid sinus cavities causes pain to radiate all over the back and top of the skull...at least in my fairly uncommon case (pan-sinusitis isn't exactly a regular occurrence in the medical field).
The following link is to a page with diagrams and CT scans which explains the placement of the different cavities, and their relation to other parts of one's anatomy. In my case, most of the honeycombed bones were broken apart and sucked out, as well as the linings of the sinus cavities being shaven (additional work done included turbinoplasty, septoplasty, and some other kind of gory stuff).
Sinus CT Scan, Sinusitis - W. S. Tichenor, M. D.
Glad you're interested, Trux, and again...sorry if my layperson's referral to the exact anatomy of the human sinuses caused any confusion and/or frustration.
Cheers!
