This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'The nerve that is related to pyriform recess in pharynx: \nSelect and explain. \nA. Recurrent laryngeal, B. External laryngeal, C. Internal laryngeal, D. Glosso pharyngeal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PYRIFORM FOSSA:\nIt is a deep recess broad above and narrow below in the anterior part of lateral wall of the laryngopharynx, on each side of the laryngeal inlet.\xa0\nThese recesses are produced due to bulging of larynx into laryngopharynx.\nBoundaries:\nMedial: Aryepiglottic fold and quadrangular membrane of larynx.\nLateral: Mucous membrane covering the medial surface of the lamina of thyroid cartilage and thyrohyoid membrane.\nThe internal laryngeal nerve and superior laryngeal vessels pierce the thyrohyoid membrane and traverse underneath the mucous membrane of the floor of the fossa to reach the medial wall.\nAbove: Piriform fossa is separated from epiglottic vallecula by lateral glossoepiglottic fold.\nKey Concept:\nInternal laryngeal nerve is the nerve related to pyriform fossa.', 'role': 'assistant'}]