Malleus is a part of

The internal ear develops from which embryonic layer?

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 $Q$.
$P \quad\quad Q$

Match the following:

Column-$I$	Column-$II$
$(a)$. Incus	$(i)$. Hammer shaped
$(b)$. Malleus	$(ii)$. Stirrup shaped
$(c)$. Stapes	$(iii)$. Anvil shaped

Match the columns and select the correct option:

$(a)$ Organ of Corti	$(i)$ Connects middle ear to pharynx
$(b)$ Cochlea	$(ii)$ Coiled portion of the labyrinth
$(c)$ Eustachian tube	$(iii)$ Attached to the oval window
$(d)$ Stapes	$(iv)$ Located on the basilar membrane

$(a)\quad (b)\quad (c)\quad (d)$

Scala vestibuli is connected with