**Question:** Laryngocele arises as herniation of laryngeal mucosa through the following membrane:

A. Epiglottis
B. Arytenoid cartilage
C. Lamina propria
D. Vocal cord

**Core Concept:** Laryngocele is a condition characterized by the herniation of laryngeal mucosa through a weak area in the surrounding connective tissue. In this case, we need to identify the specific membrane where this herniation occurs.

**Correct Answer: B. Arytenoid cartilage**

Laryngocele typically occurs due to herniation through the cartilaginous rings of the larynx, specifically the arytenoid cartilage. The arytenoid cartilage is a part of the cricoarytenoid joint, which connects the arytenoid body to the thyroid cartilage. This joint allows for the mobility of the arytenoid cartilage, contributing to the opening and closing of the glottis during respiration. When the mucosa herniates through this area, it results in the formation of a laryngocele.

The other options are not relevant to the formation of laryngocele:

**A. Epiglottis:** The epiglottis is a different structure in the larynx, responsible for covering the glottis during swallowing. It is not involved in the formation of laryngocele.

**C. Lamina propria:** Lamina propria is a layer of connective tissue within the walls of the larynx, but it is not the specific membrane involved in the herniation of laryngocele.

**D. Vocal cord:** Vocal cords are the two folds of mucous membrane in the larynx that produce sound during speech. They are not involved in the formation of laryngocele.

**Why the Correct Answer is Right:** The arytenoid cartilage is crucial in allowing for the mobility of the arytenoid body to the thyroid cartilage, enabling the opening and closing of the glottis during respiration. When the mucosa herniates through this weak area, it results in the formation of a laryngocele.

**Why Each Wrong Option is Invalid:** The epiglottis, lamina propria, and vocal cords are not directly involved in the formation of laryngocele. They are part of the larynx but are not the specific membrane responsible for the herniation of mucosa in laryngocele.

**Clinical Pearls:** Laryngocele is a relatively rare condition, occurring more commonly in men than women with a history of chronic hoarseness, stridor, or dyspnoea. Treatment options include conservative management (medication, voice therapy, or endoscopic surgery) or open surgical repair. Early diagnosis and treatment are crucial to prevent complications such as compression of the airway and potential obstruction.