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
Epiglottis is derived from ? 
Select and explain. 
A. 3rdeg arch, B. 4th arch, C. 5th arch, D. 6th arch
B: 4th arch
Answer: B: 4th arch 
Explanation: Ans. is 'b' i.e., 4th archAll cailages of larynx (except arytenoid) are derived from 4th arch - epiglottis, cricoid, thyroid, corniculate and conciform.Arytenoid is derived from 6" arch.See explanation-8 of session-1.NoteDevelopment of laryngeal cailages is controversial. According to some textbooks, all laryngeal cailages are derived from 4th arch, except arytenoids, which is developed from 6th arch. But some other textbooks say that thyroid, epiglottis and cuneiform are derived from 4th arch whereas corniculate, arytenoid and cricoid are derived from 6" arch.However, there is no confusion about following facts :?All cailages of larynx are developed from 4th and 6" arch.Epiglottis, thyroid and cuneiform are derived from 4" arch.