The Eustachian tube connects $A$ cavity with $B$. Choose the correct option for $A$ and $B$.

Analogy type question:
$(1)$ Inner ear : Vestibular apparatus :: Cochlea : .........
$(2)$ Organ of Corti : Hair cells :: Tectorial membrane : ........

The other name for the $scala$ $media$ is:

Select the correct sequence for the mechanism of hearing.
$I -$ Sound waves,$II -$ Oval window,$III -$ Hair cells press against the tectorial membrane,$IV -$ Auditory cortex,$V -$ Auditory nerve,$VI -$ Waves in lymph,$VII -$ Tympanic membrane,$VIII -$ Movement in basilar membrane,$IX -$ Ear ossicles,$X -$ Generation of nerve impulses.

The three tiny bones present in the middle ear are called ear ossicles. Write them in the correct sequence beginning from the ear drum.

Scala vestibuli, scala media and scala tympani of the human ear contain: