**Core Concept**
An external laryngocele is a type of herniation that involves the laryngeal saccule, which is a small, diverticulum-like structure extending from the laryngeal ventricle. This condition arises due to an abnormal communication between the laryngeal saccule and the laryngeal ventricle, leading to the accumulation of air and/or mucus.

**Why the Correct Answer is Right**
The external laryngocele arises from the **laryngeal saccule**, which is a small, mucosal outpouching extending from the laryngeal ventricle. The laryngeal saccule is a normal anatomical structure, but in cases of external laryngocele, it becomes abnormally dilated and herniates through the thyrohyoid membrane, leading to the characteristic clinical presentation.

**Why Each Wrong Option is Incorrect**
* **Option A:** The false vocal cord is not directly related to the development of an external laryngocele.
* **Option B:** The aryepiglottic fold is not a part of the laryngeal saccule or the structure from which an external laryngocele arises.
* **Option D:** The cricoid cartilage is a part of the laryngeal skeleton, but it is not directly involved in the formation of an external laryngocele.

**Clinical Pearl / High-Yield Fact**
It's essential to recognize that external laryngocele can present with symptoms such as a mass in the neck, voice changes, and respiratory distress. In some cases, it may be associated with a history of chronic coughing or straining.

**Correct Answer:** C. laryngeal saccule