Anatomy During development, the pas of ear develops at different intervals. All of the following are of adult size at bih, EXCEPT: A Oval window B Ear Ossicles C Middle ear cavity D Maxillary antrum 💡 Explanation During development, the pas of ear develops at different intervals. All of the following are of adult size at bih, EXCEPT: ✓ Correct Answer: D. Maxillary antrum