Quadrilateral cailage is attached to all of the following structures, EXCEPT:
**Core Concept**
The quadrilateral cartilage, also known as the quadrilateral ligament, is a fibrocartilaginous structure located in the anterior part of the nasal septum. It plays a crucial role in supporting the nasal septum and maintaining the patency of the nasal passages.
**Why the Correct Answer is Right**
The quadrilateral cartilage is attached to the perpendicular plate of the ethmoid bone, the vomer bone, and the nasal crest of the maxillary bone. It forms a firm attachment to these structures, thereby providing stability to the nasal septum. The quadrilateral cartilage also receives attachments from the septal cartilage, which is a separate cartilaginous structure located in the midline of the nasal septum.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the quadrilateral cartilage is not attached to the inferior turbinate. The inferior turbinate is a separate bony structure that is located in the nasal cavity and is not directly attached to the quadrilateral cartilage.
* **Option B:** This option is incorrect because the quadrilateral cartilage is not attached to the external nasal valve. The external nasal valve is a critical structure that regulates airflow through the nasal passages, but it is not directly attached to the quadrilateral cartilage.
* **Option C:** This option is incorrect because the quadrilateral cartilage is not attached to the nasal conchae. The nasal conchae are bony structures that are located in the nasal cavity and are not directly attached to the quadrilateral cartilage.
**Clinical Pearl / High-Yield Fact**
The quadrilateral cartilage is a critical structure that plays a key role in maintaining the patency of the nasal passages. It is a common site for septal hematoma and should be carefully evaluated in patients with nasal trauma or nasal obstruction.
**Correct Answer: A. Inferior turbinate.**