Which of the following is not a pneumatic bone:
Ethmoid
Sphenoid
Maxillary
Mandible
Pneumatic bones are those bones which contain an air filled cavity within them which make them light in weight. In humans, they are seen in relation to nasal cavity & enclose paranasal sinuses. Besides making the skull light in weight they also help in resonance of sound & act as air conditioning chambers for inspired air. Pneumatic bones are - maxilla, frontal bone, sphenoid, ethmoid and Mastoid
Paranasal Sinuses