<prompt> Nerve liable to get injured on removing the fish bone from pyriform fossa:-Superior laryngeal nerveInternal laryngeal nerveExternal laryngeal nerveRecurrent laryngeal nerve  <response>: Pyriform fossa is located on the side of epiglottis. It is supplied by Internal laryngeal nerve. Hence this nerve is liable to get injured while removing a fish bone from pyriform fossa. . 