(A) The internal ear,also known as the labyrinth,consists of two main parts:$1$. The bony labyrinth: $A$ series of channels filled with a fluid called

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Bony labyrinth and membranous labyrinth

(A) The internal ear,also known as the labyrinth,consists of two main parts:$1$. The bony labyrinth: $A$ series of channels filled with a fluid called perilymph.$2$. The membranous labyrinth: $A$ series of sacs and ducts located inside the bony labyrinth,filled with a fluid called endolymph.