Anatomy model of a childs ear. One a nd a half times the size of a childs ear.Iluustrating the semi-circular canals Cochlea of the inner earAuditory ocssicles,. Otitis Media fluid in the middle ear Tympanic membrane and temporal and Tympani muscles. Also has a horizontal Eustacian tube typical of a child Size- 43/4 x 4x 31/2. Canal size 61/4 x 51/4