## Laryngopharynx: Definition and Boundaries ### Anatomical Extent **Key Point:** The laryngopharynx (also called hypopharynx) extends from the epiglottis superiorly to the cricoid cartilage inferiorly, at approximately the level of the C6 vertebra. Below the cricoid cartilage, the pharynx transitions into the esophagus. ### Structural Features of the Laryngopharynx **High-Yield:** The laryngopharynx is the **only purely digestive segment** of the pharynx. Unlike the nasopharynx (respiratory) and oropharynx (mixed respiratory-digestive), the laryngopharynx has no respiratory function. ### Key Anatomical Landmarks - **Piriform fossae**: Paired recesses on either side of the laryngeal inlet; common site for foreign body impaction - **Post-cricoid region**: Area immediately posterior to the cricoid cartilage; site of Plummer-Vinson web formation - **Posterior pharyngeal wall**: Directly continuous with esophageal wall **Clinical Pearl:** The laryngopharynx is a common site for esophageal carcinoma (especially at the post-cricoid region). Dysphagia in this region suggests pathology requiring urgent endoscopic evaluation. **Mnemonic:** **"Laryngo = Larynx-related"** — The laryngopharynx is the pharyngeal segment most intimately associated with the larynx, lying directly anterior to it. ### Distinction from Hypopharynx **Warning:** "Laryngopharynx" and "hypopharynx" are **synonymous terms** — both refer to the same anatomical region (the third pharyngeal division). The term "hypopharynx" is more commonly used in clinical and surgical practice. 
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