What does the Thyroepiglottic muscle do?
What does the Thyroepiglottic muscle do?
The thyroepiglottic muscle originates on the internal surface of the thyroid cartilage and inserts on the margin of the epiglottis. When contracting, this muscle inferiorly displaces the epiglottis. These muscles work synergistically to close the laryngeal inlet by pulling the epiglottis posteriorly and inferiorly.
What is the 3 important laryngeal muscles and the corresponding functions?
Laryngeal Muscles
| Vocalis | Increases the thickness of the vocal cords |
|---|---|
| Thyroarytenoid | Shortens and relaxes the vocal folds |
| Thyroepiglottic | Depresses the epiglottis |
| Cricothyroid | Lengthens and stretches the vocal cords |
| Lateral cricoarytenoid | Closes the glottis |
What muscles control the epiglottis?
The lateral margins of the epiglottis are connected with the arytenoid cartilages of the larynx via the aryepiglottic folds. Each fold contains the aryepiglottic muscle, which plays an important role in the movements of the epiglottis.
What muscles elevate the larynx when swallowing?
Inferior pharyngeal constrictor muscles: attaches anteriorly along the lateral regions of the thyroid and cricoid cartilages, and runs superiorly and posteriorly to meet with opposing fibers at the posterior median raphe of the pharynx. This muscle elevates the larynx.
What muscle abducts the vocal cords?
posterior cricoarytenoid
Internal musculature is the primary group of muscles involved in phonation by either abducting or adducting the vocal folds. The sole abductor of the group is the posterior cricoarytenoid. The muscles, lateral cricoarytenoid, thyroarytenoid, interarytenoid, and cricothyroid, all act together to adduct the vocal folds.
What muscles control the vocal cords?
Muscles
- Posterior cricoarytenoid – These are the only muscles involved in abduction.
- Lateral cricoarytenoid – These are adductors.
- Thyroarytenoid – These are the muscles that form the body of the vocal folds themselves.
- Cricothyroid – These are the vocal fold lengtheners.
What muscle relaxes the vocal cords?
thyroarytenoid muscle
Function. The thyroarytenoid muscle, consisting of two parts having different attachments and different directions, is rather complicated as regards its action. Its main use is to draw the arytenoid cartilages forward toward the thyroid, and thus relax and shorten the vocal folds.
What causes the epiglottis to malfunction?
Epiglottitis is usually caused by an infection from Haemophilus influenza type b (Hib) bacteria, the same bacteria that cause pneumonia and meningitis. Transmission of the bacteria is the same as with the common cold: Droplets of saliva or mucus are spread into the air when a carrier of the bacteria coughs or sneezes.
Which muscle opens the glottis?
Posterior cricoarytenoid
Posterior cricoarytenoid – These are the only muscles involved in abduction. They open the glottis by pulling the back ends of the arytenoid cartilages together.
