Instead of the external ear structures found in mammals, birds have small, feather-covered openings on the sides of their ...

Inpushing from the surface of the embryo occurs during the formation of the ear and forms the external auditory meatus (reptiles and up) or ear canal. No outer ear existed in amphibians. The tympanum, ...

The three types of hearing loss are conductive, sensorineural, and mixed. Conductive hearing loss involves the sound conducting outer or middle ear and occurs with decreased transmission of sound ...