The cricoid cartilage is the ring-shaped cartilage at the lower part of the larynx, above the trachea. Unlike the shield-shaped thyroid cartilage, it forms a complete cartilaginous ring, with a broader posterior plate. It helps support the airway and provides articulations and muscle attachments within the laryngeal framework.[ref]
Anatomy and Physiology 2e by J. Gordon Betts and others. Section 22.1, Larynx: cricoid, thyroid and associated cartilages
The ring geometry and its connections matter mechanically. Laryngeal muscles move connected cartilages to alter vocal-fold position and tension; those motions can change the opening through which air passes. A static anatomical ring therefore participates in an actively controlled valve and sound-producing assembly.
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