Category: 

What is an Epiglottis?

The hyoid bone triggers movement of the epiglottis during swallowing.
Article Details
  • Written By: Mary McMahon
  • Edited By: Bronwyn Harris
  • Last Modified Date: 08 April 2014
  • Copyright Protected:
    2003-2014
    Conjecture Corporation
  • Print this Article
Free Widgets for your Site/Blog
According to popular legend, Emperor Nero fiddled while Rome burned.   more...

April 18 ,  1775 :  Paul Revere went on his famous nighttime ride.  more...

An epiglottis is an anatomical structure that is designed to prevent animals from inhaling foods or liquids while they eat and swallow. You could think of it as a lid or flap which covers the trachea, creating a seal that does not permit anything other than air to enter the trachea. This anatomical structure is very important, as without it, an organism would run the risk of choking and coughing every time it tried to eat.

To use an analogy which may be familiar to you, the epiglottis is a lot like a toilet seat attached to the root of the tongue. During normal activities, it is left in the up position, allowing air to flow freely into the larynx and trachea. However, when an organism starts eating, the epiglottis snaps shut, covering the opening into the trachea. When the organism is done swallowing, the flap pops back up again to allow the organism to breathe.

The function of the epiglottis is made possible by the fact that it is made from elastic cartilage. Cartilage is typically very stiff, but elastic cartilage tissue is made up of tiny bundles of extremely elastic fibers which make it flexible as well as sturdy. When coated with mucus membranes, as in the case of this structure, elastic cartilage tissue is soft enough to form a tight seal, and stiff enough to hold up against the action of swallowing.

Ad

Movement of the epiglottis is triggered by movements of the hyoid bone during swallowing, which means that organisms do not need to learn to move it during swallowing, because they are born with the ability to do so. Because the structure is not controlled by brain activity, it is also not dependent on nerve signals; it's basically like a mechanized part that requires no real maintenance on the part of the user.

Sometimes, the epiglottis can become inflamed, in a situation known as epiglottitis. The inflammation causes the flap to swell, and this can potentially be extremely dangerous, as the swollen tissue may inhibit breathing. Prompt treatment is required for such inflammation to ensure that the patient will be able to breathe, and in some cases the patient may need to be intubated to secure his or her airway until the cause of the swelling can be resolved.

Ad

Discuss this Article

pollick
Post 1

When I was a child, my mother used to examine my mouth and throat for redness. I remember being fascinated by the little piece of skin dangling from the back of my throat. I had no idea it had a name or a real function. I remember how painful it could get when I had strep throat or a bad cold, however.

Post your comments

Post Anonymously

Login

username
password
forgot password?

Register

username
password
confirm
email