Glosaurus
Human Anatomy

Cricothyroid joint

A critical connection between the thyroid and cricoid cartilages in the larynx.
The cricothyroid joint is a synovial joint located in the larynx, formed between the inferior horn of the thyroid cartilage and the cricoid cartilage. It is responsible for allowing a pivotal motion that aids in adjusting the tension of the vocal cords.
Terminologia Anatomica
articulatio cricothyroidea
System
Endocrine system
Function
The primary function of the cricothyroid joint is to facilitate the movement of the thyroid cartilage relative to the cricoid cartilage, which plays a vital role in modulating pitch during phonation. By tilting forward, the thyroid cartilage increases the tension on the vocal cords, allowing for higher pitch sounds. Conversely, when it tilts backward, the tension decreases, leading to lower pitch sounds. This intricate mechanism is crucial for producing a wide range of vocal tones and is essential for effective communication and expression in human speech.
Location
The cricothyroid joint is situated in the neck, specifically within the laryngeal framework, which is positioned just below the thyroid cartilage and above the trachea. The joint is located at a region known as the laryngeal prominence, or Adam's apple, and plays a pivotal role in connecting two essential cartilages of the larynx. Surrounding this joint are various muscles and ligaments that assist in its movement and are integral to the function of the vocal cords.
Did You Know?
  • The cricothyroid joint is the only joint in the larynx that allows for significant movement, allowing the primary adjustments necessary for pitch modulation.
  • In addition to pitch adjustments, the movement of this joint helps protect the airway during swallowing, providing structural support to the larynx.
  • Dysfunction or injury to the cricothyroid joint can lead to voice disorders, affecting clarity and the ability to modulate sound effectively.