Inspect the oropharynx [cross-section]. It is located between the soft palate and the epiglottis. The opening of the oral cavity into the oropharynx is bordered superiorly by the soft palate, inferiorly by the base of the tongue, and laterally by two mucosa folds.
The anterior lateral mucosa fold is the palatoglossal fold; the posterior lateral mucosa fold is the palatopharyngeal fold [probe] (Figure 31.4). These folds cover the palatoglossus muscle and the palatopharyn- geus muscle, respectively. The palatine tonsil [cross-section] is located between the folds and rests in the tonsilar fossa [probe]. Lymphoid tissue, called the lingual tonsil [probe] is present at the base of the tongue.
Posterior to the tongue and anterior to the epiglottis, identify the vallecula. The vallecula is a depression between the base of the tongue and the anterior surface of the epiglottis. The vallecula is divided into right and left parts by a median glossoepiglottic fold [probe].
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