How the larynx works in throat while swallowing?

When you swallow, your larynx (voice box) moves up and forward to close off the airway and prevent food or liquid from entering your lungs. This is called the laryngeal elevation or swallowing reflex.

Here's a step-by-step explanation of how the larynx works in throat while swallowing:

1. Initiation of Swallowing: When you start swallowing, your brain sends a signal to the muscles of your throat and mouth to contract. These muscles help propel the food or liquid toward the back of your throat.

2. Closure of Epiglottis: As the food or liquid reaches the back of your throat, a small flap of cartilage called the epiglottis flips down to cover the opening of the trachea (windpipe). This prevents food or liquid from entering your lungs.

3. Elevation of Larynx: Simultaneously with the closure of the epiglottis, the muscles surrounding your larynx contract, causing it to lift up and forward. This movement further helps seal off the trachea and prevents aspiration (inhalation) of food or liquid.

4. Peristalsis: Once the larynx is elevated and the epiglottis is closed, peristaltic waves (rhythmic contractions) of the muscles in the esophagus begin. These waves push the swallowed material down the esophagus toward the stomach.

The entire swallowing process is typically completed in less than a second. It is a complex and involuntary reflex that occurs automatically when you swallow. If the laryngeal elevation or swallowing reflex doesn't work properly, it can lead to aspiration and potential lung infections.