Start your One-Week Free Trial
Already subscribed? Log in »
Paranasal Sinuses
Paranasal Sinuses
Hollow spaces in the bones; named according to the bones.
The frontal sinus is in the forehead.
The ethmoidal air cells are small cavities collectively called the ethmoid sinus, lie between the eyes and behind the bridge of the nose.
Maxillary sinus is a space in each cheekbone.
Sphenoid sinus in the sphenoid bone.
The paranasal sinuses communicate with the nasal cavity, and their mucosal linings help to warm the inspired air and trap particles.
Unfortunately, infection can spread from the nasal cavity to the paranasal sinuses, leading to a sinus infection.