Cricoarytenoid joint

A pivotal joint in the larynx involved in voice production and airway regulation.

The cricoarytenoid joint is a synovial joint located between the cricoid and arytenoid cartilages of the larynx. This joint permits a range of movements essential for adjusting the tension and position of the vocal cords, which play a crucial role in phonation and breathing. Movement at this joint is fundamental for normal vocal function and airway management.

Terminologia Anatomica

articulatio cricoarytenoidea

System

Respiratory system

Function

The primary function of the cricoarytenoid joint is to facilitate the movement of the arytenoid cartilages, which directly impacts the tension and shape of the vocal cords. When the arytenoid cartilages rotate or slide, the vocal cords can be tightened or relaxed, allowing for the modulation of pitch and volume during speech. This dynamic capability is essential not only for effective communication but also for protecting the airway during swallowing, as it helps close the glottis, preventing food or liquids from entering the trachea. Furthermore, the regulation of glottal size via this joint contributes to respiratory functions, ensuring that airflow can be appropriately controlled during inhalation and exhalation. The intricate coordination of movements at the cricoarytenoid joint highlights its critical role in both voice production and respiratory safety.

Location

The cricoarytenoid joint is situated in the larynx, specifically connecting the cricoid cartilage, which forms the base of the larynx, to the arytenoid cartilages, which are positioned at the posterior part of the laryngeal framework. The cricoid cartilage is a complete ring of cartilage located below the thyroid cartilage and above the trachea, while the arytenoid cartilages are paired structures that sit atop the cricoid, like two small pyramids. This joint is located approximately 1 to 2 centimeters above the trachea and is strategically positioned to control the vocal folds housed within the larynx, allowing for precise adjustments needed during vocalization and respiration.

Did You Know?

The cricoarytenoid joint is often referred to as the 'voice joint' because of its critical role in producing sounds.
Dysfunction or injury to the cricoarytenoid joint can lead to vocal cord paralysis, affecting speech and breathing.
This joint is capable of both sliding and rotating movements, which enhances its ability to finely tune vocal cord tension.