Which of the bone is NOT a component of the bony pa of nasal septum?
**Core Concept**
The nasal septum is a partition made of bone and cartilage that separates the nasal cavity into two nostrils. The bony part of the nasal septum is formed by the perpendicular plate of the ethmoid bone, the vomer bone, and the septal crest of the maxilla and palatine bones.
**Why the Correct Answer is Right**
The bony part of the nasal septum primarily consists of the perpendicular plate of the ethmoid bone, the vomer bone, and the septal crest of the maxilla and palatine bones. The turbinates, however, are long, curved bones that project from the lateral walls of the nasal cavity and are involved in air filtration and humidification. They are not a component of the bony part of the nasal septum.
**Why Each Wrong Option is Incorrect**
* **Option A:** The perpendicular plate of the ethmoid bone is a component of the bony part of the nasal septum.
* **Option B:** The vomer bone is a component of the bony part of the nasal septum.
* **Option D:** The septal crest of the maxilla and palatine bones are components of the bony part of the nasal septum.
**Clinical Pearl / High-Yield Fact**
The nasal septum can be deviated, leading to nasal obstruction, and can be a source of bleeding (epistaxis). The septal cartilage can be injured in nasal trauma, leading to a saddle nose deformity.
**Correct Answer:** C. Turbinates are not a component of the bony part of the nasal septum.