True regarding the development of ear:
A i.e. Eustachian tube opens at the level of inferior turbinate; B i.e. Pinna develops from the cleft of arch; C i.e. Growth of inner ear completed by 4th monthEustachian tube connects tympanic cavity with nasopharynx. It is about 36cm long in adults and runs downwards, forwards & medially at an angle of 45deg with horizontal from bony tympanic end to slit like pharyngeal end. Tympanic end is in the anterior wall of middle ear, just above the level of floor. While nasopharyngeal end is situated in the lateral wall about 1 -1.25 cm behind the posterior end of inferiro turbinateQ
Eustachian tube opens at the level of interior turbinate
Pinna develops from the cleft of Ist arch
Growth of the inner- ear completed by 4th month
All