Metallic cast of the combined pneumatic cavities of the face
a. inferior nasal fossa
b. median nasal fossa
c. superior nasal fossa
d. sphenoidal sinus
e. internal carotid artery
f. sheath of the optic nerve
g. antrum of Highmore (maxillary sinus)
h. infundibulum (ethmoidal infundibulum)
i. nasolacrymal canal
k. ethmoidal cells
l. frontal sinus
Much of the frontal skull consists of pneumatic (air-filled) cavities. Many of these are known as sinuses.
While the function of our sinuses is not fully understood, they’re known to effect the filtration of inhaled air, and decrease the weight of our skull.
Atlas and Text-Book of Dentistry including Diseases of the Mouth. Gustav Preiswerk, 1909.