Nerve liable to get injured on removing the fish bone from pyriform fossa:-
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. .
Superior laryngeal nerve
Internal laryngeal nerve
External laryngeal nerve
Recurrent laryngeal nerve
Pharynx, larynx and trachea and cranial nerves 3,4,6