Which of the following correctly lists the structures through which sound travels after entering the ear?
a. auditory canal, eardrum, ossicles, cochlea
b. ossicles, eardrum, cochlea, auditory canal
c. eardrum, auditory canal, ossicles, cochlea
d. cochlea, eardrum, ossicles, auditory canal

Explanation:

This is the correct order, when sound travels after entering the ear, first it pass through the auditory canal or the external acoustic meatus, then goes though the eardrum or tympanic membrane which transmit the sound from the external to the middle ear. Later, the sound pass through ossicles which are three tiny bones that are connected from the middle ear to the inner ear. At last, sound reach the cochlea, which is part of the inner hear and it has the shape of a snail. (For a better illustration, refer to the image attached)

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