Are there any sinus cavities in the back of your head?

Sinuses. Ethmoid sinus is behind your nose and eye area. Frontal sinus above eye (forehead area) maxillary sinus (cheek bone area). . There are other terms like cavernous sinus, sigmoid sinus (this one is on the back of head)hope this help. Talk to your doctor. Let us help with clinical symptoms , diagnosis, and terminology.
Sinuses. All in the front, around your eyes, nose, above your teeth. You have a communication back through the ears, to the bone behind the ear, the mastoid processes. No sinuses from the respiratory tract in the back of your head.