<prompt> Which of the following is not included in hypopharynx?Pyriform fossaPost cricoid regionAnterior pharyngeal wallPosterior pharyngeal wall  <response>: c Anterior pharyngeal wallRef. Scott Brown, Vol 3; 743Anterior pharyngeal wall is no entity. Anterior to the hypopharynx is the larynx. Anterior to the nasopharynx and oropharynx are nasal and oral cavities respectively. 