the mucosae of these two regions are continuous, so ear infections may follow a core throat or other types of pharyngeal infections.
It is important that the auditory tubes and the sinuses drain into the nasal cavities and nasopharynx because otherwise they would become blocked with mucus and prevent respiration.
Sinuses
No, they are not.
SINUSES
Sinuses
The cranial cavity is the primary cavity of the skull; it contains the brain. In addition, the skull has four other pairs of cavities called sinuses. They are the frontal sinuses, maxillary sinuses, sphenoid sinuses, and ethmoid sinuses.
If by sinus cavities you mean the confluences of the sinuses, then Yes
The ventricles are cavities within the brain that connect with each other, with the subarachnoid space of the meninges and with the central canal of the spinal cord.
sinuses.
often called Sinuses
Frontal Sinuses.....
They are all connected. The nasopharynx is connected posterior and inferiorly to the paranasal sinuses and is connected to the middle ear by the auditory (Eustachian) tubes. The mucous membranes of the nose, paranasal sinuses, pharynx, and middle ear are all connected by ducts. Infections can spread through all those areas.