The cricothyroid ligament makes up the largest part of the laryngeal membrane, consisting of a median (anterior) and twin lateral ligaments. The median cricothyroid ligament is a flat band of white tissue joining the cricoid and thyroid cartilages.
The lateral cricothyroid ligament is also known as the conus elasticus. The main function of the ligament is to keep the cricoid and thyroid from traveling too far. This ligament is cut during emergency cricothyrotomy.
Image Caption: Larynx – antero-lateral view, with external muscles of larynx visible. Version with english descriptions on the picture. Credit: Olek Remesz/Wikipedia(CC BY-SA 2.5)