This file is from a shared repository and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionSinuses (5937618994).jpg
In humans, there are four pairs of cavities (air-filled spaces) known as paranasal sinuses. These small hollow spaces, which are located within the skull or bones of the head surrounding the nose, are named for the bones that contain them, as follows:
Frontal sinuses over the eyes in the brow area
Maxillary sinuses inside each cheekbone
Ethmoid sinuses just behind the bridge of the nose, between the eyes
Sphenoid sinuses behind the ethmoids in the upper region of the nose and behind the eyes
The paranasal sinuses open into the nasal cavity and are lined with cells that make mucus to keep the nose from drying out during breathing and to trap unwanted materials so that they do not reach the lungs. Credit: NIAID
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue