The larynx is also known as the voice box. It is a 2 inches (5cm) long tube in adults. It is loacted above the windpipe (trachea) in the neck and in front of the food pipe. The food pipe in the upper part of the neck is called the pharynx.

CROUP COUGH: The image shows a normal lumen of the bronchus and an inflamed lumen containing mucus, in case of bronchial asthma.

The voice box is present in front of the neck and contains the vocal cords. The larynx is responsible for sound production and swallowing. It is also the entrance to the windpipe, and plays a critical role in the airway.

Croup leads to irritation in the upper airways and cause them to swell. As the airway below the vocal cords become narrow, it becomes difflicult to breath. Your breathing will become noisy and you will experience a high-pitched cough. This occurs due to narrowing of lumen due to thickened smooth muscles linning the airways.