## Cricoid Cartilage — Structural Role **Key Point:** The cricoid cartilage is the only laryngeal cartilage that forms a complete ring, providing the structural foundation of the larynx. ### Anatomical Features | Feature | Cricoid | Thyroid | Arytenoid | | --- | --- | --- | --- | | **Shape** | Complete ring (signet ring) | Incomplete shield | Paired pyramids | | **Articulation with trachea** | Yes (direct) | No | No | | **Encircles larynx** | Yes, completely | Partially (anterolateral) | No | | **Attachment of vocal cords** | Indirectly (via arytenoids) | Anteriorly | Posteriorly | ### Clinical Significance **High-Yield:** The cricoid cartilage is the narrowest point of the pediatric airway and is clinically important for: - Endotracheal tube sizing in children (uncuffed tubes used at cricoid level) - Cricoid pressure (Sellick maneuver) during rapid sequence intubation - Surgical landmark for tracheostomy **Clinical Pearl:** Cricoid compression during anesthesia induction compresses the esophagus against the cervical spine, preventing gastric aspiration — a direct application of the cricoid's complete ring anatomy. ### Why Cricoid Is Unique The cricoid's complete ring structure distinguishes it from all other laryngeal cartilages: - **Thyroid cartilage:** Shield-like, incomplete posteriorly - **Arytenoid cartilages:** Paired, pyramid-shaped, sit atop the cricoid - **Epiglottis:** Leaf-shaped, elastic cartilage, not part of the rigid framework [cite:Gray's Anatomy 42e Ch 33] 
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