Who said that?

“Structures innervated by the upper cervical spinal roots (upper cervical neck muscles, joints, ligaments and discs) are established sources of pain. These structures elicit occipital pain sensations, but may also be perceived in trigeminal innervated areas (head , face, mandible)"

Goadsby PJ, Bartsch T Anatomy and physiology of pain referral patterns in primary and cervicogenic headache disorders. Headache Currents 2005;10:42-48.