You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Middle ear cavity is formed by pharyngeal pouch and explain in detail?
Pouch Derivatives 1st Eustachian tube(opens into nasopharynx) and middle ear cavity 2nd Lines tonsillar crypts, forms endodermal epithelium of tonsil 3rd Dorsal - Inferior parathyroid glands Ventral - Thymus 5th fuses with 4th pouch Dorsal - Superior parathyroid glands Ventral - Ultimobranchial body recieves neural crest cells and changes to parafollicular c cells