Alternate phrasing: Which bone forms the inferior portion of the nasal septum?

Alternate phrasing: Which bone forms the inferior portion of the nasal septum?

• A. Vomer
• B. Ethmoid bone
• C. Nasal bone
• D. Maxilla

Answer: (A)

The nasal septum is the divider between the two nasal cavities, with its bony portion made up of the superior part from the perpendicular plate of the ethmoid and the inferior part from the vomer. The vomer is a thin, blade-like bone that descends to join the perpendicular plate of the ethmoid, forming the lower half of the septum. The ethmoid bone supplies the upper portion, while cartilage covers the anterior part. The nasal bones and maxilla contribute to the external nose and lateral walls rather than the septal division, so they don’t form the inferior septum. Therefore, the bone forming the inferior portion is the vomer.

The nasal septum is the divider between the two nasal cavities, with its bony portion made up of the superior part from the perpendicular plate of the ethmoid and the inferior part from the vomer. The vomer is a thin, blade-like bone that descends to join the perpendicular plate of the ethmoid, forming the lower half of the septum. The ethmoid bone supplies the upper portion, while cartilage covers the anterior part. The nasal bones and maxilla contribute to the external nose and lateral walls rather than the septal division, so they don’t form the inferior septum. Therefore, the bone forming the inferior portion is the vomer.