<prompt> The lymphatic drainage of pyriform fossa is toPrelaryngeal nodeParapharyngeal nodesMediastinal nodesUpper deep cervical nodes  <response>: Lymphatic drainage of Hypopharynx 1 Pyriform sinus drains into upper jugular chain and then to deep cervical group of lymph nodes. 2 Postcricoid region drains into parapharyngeal and paratracheal group of lymph nodes. 3 Posterior pharyngeal wall drains into parapharyngeal lymph nodes and finally to deep cervical lymph nodes. Ref:- Tuli; pg num:- 231, 232 