Cricothyroid joint

Anatomical structure in the human larynx

The cricothyroid joint is a pivotal structure in the human larynx, playing a crucial role in the modulation of voice pitch. It is a synovial joint that connects the cricoid cartilage and the thyroid cartilage, allowing for the adjustment of tension in the vocal cords.

Diagram of the larynx showing the cricothyroid joint

Anatomy

The cricothyroid joint is located in the anterior part of the neck, where the inferior horn of the thyroid cartilage articulates with the lateral aspect of the cricoid cartilage. This joint is supported by a capsule and ligaments, which provide stability while allowing for the necessary movement.

Function

The primary function of the cricothyroid joint is to facilitate the tension and elongation of the vocal cords. This is achieved through the action of the cricothyroid muscle, which tilts the thyroid cartilage forward and downward, increasing the distance between the thyroid and arytenoid cartilages. This action results in the tightening of the vocal cords, thereby raising the pitch of the voice.

Clinical significance

Dysfunction or injury to the cricothyroid joint can lead to voice disorders, as it impairs the ability to modulate pitch. Conditions such as cricothyroid arthritis or trauma to the neck can affect the joint's function. Surgical procedures involving the larynx must take care to preserve the integrity of the cricothyroid joint to maintain normal vocal function.

Related pages

• Larynx
• Vocal cords
• Cricoid cartilage
• Thyroid cartilage