**Core Concept:**
The nasal septum is the structure that divides the nasal cavity into two halves. It is composed of cartilage and bone, and is essential for maintaining the structural integrity of the nasal cavity.

**Why the Correct Answer is Right:**
The correct answer, option C ( **"Dura mater"** ), is incorrect because dura mater is a thick, tough layer of white, fibrous connective tissue that forms the outer cover of the brain and spinal cord. It is not a component of the nasal septum.

**Why Each Wrong Option is Incorrect:**
Option A ( **"Meninges"** ) is incorrect because meninges are the three layers of membranes that cover and protect the brain and spinal cord, not a part of the nasal septum.

Option B ( **"Parietal peritoneum"** ) is incorrect because parietal peritoneum is a layer of serous membrane that lines the abdominal cavity and covers the abdominal organs. It is not a part of the nasal septum.

Option D ( **"Epidermis"** ) is incorrect because epidermis is the outermost layer of the skin, which is not related to the nasal septum.

**Clinical Pearl / High-Yield Fact:**
Understanding the correct answer and the incorrect options is essential for recognizing the unique structure of different body parts. A thorough knowledge of anatomy and its variations is crucial in clinical practice, particularly in nasal and sinus surgeries.

**Correct Answer:** .