pharyngeal recess pharyngeal recess behind the ostium of the eustachian tube (ostium pharyngeum tuba auditiva) is a deep recess, the pharyngeal recess (fossa of rosenmüller). pharyngeal recesslateral wall of nasal cavity. (pharyngeal recess labeled at bottom right.)front of nasal part of pharynx, as seen with the laryngoscope. (pharyngeal recess labeled at center right.)detailsidentifierslatinrecessus pharyngeusta98a05.3.01.017ta22873fma54999anatomical terminology clinical significance at the base of this recess is the retropharyngeal lymph node (the node of rouvier). this is clinically significant in that it may be involved in certain head and neck cancers, notably nasopharyngeal cancer.