The opening in the nasopharynx that permits air pressure on both sides of the tympanic membrane of the ear to be kept equal is

Structures filled with perilymph - $P$
Structures filled with endolymph - $Q$
$I -$ Scala vestibuli,$II -$ Scala tympani,$III -$ Scala media
Select the correct option for $P$ and $Q$.
$P \quad\quad Q$

Tensor tympani is a small muscle that

The lower membrane of the $scala$ $vestibuli$ is the:

Which of the following senses is impaired if the tectorial membrane is removed from a rabbit?

The $Malleus$ is present in the: