The efferent lymphatic vessels in the lymph nodes of the lateral retropharynx or in in those of the medial retropharynx form tracheal lymphatic trunks which converge into the posterior deep cervical lymphatic nodes. 咽后外侧淋巴结或咽后内侧淋巴结的输出淋巴管形成气管淋巴干,汇入颈深后淋巴结。