This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
All are Pneumatic bones except: 
Select and explain. 
A. Sphenoid, B. Ethmoid, C. Parietal, D. Frontal
C: Parietal
Answer: C: Parietal 
Explanation: Ans. C. ParietalPneumatic bones are those bones which contain an air filled cavity within them. In humans, they are seen in relation to the nasal cavity - they enclose the paranasal sinuses. Pneumatic bones are - maxilla, frontal bone, sphenoid and ethmoid