Anatomy - 6 - Anatomy of the inner ear Part 1 The...

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Anatomy of the inner ear Part 1: The vestibular system
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Inner ear
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Inner ear Houses the structures of hearing (cochlea) and balance (vestibular system) Structures are housed in a bony labyrinth and are connected by fluid. The organs are located in the membranous labyrinth that is within the bony labyrinth
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Inner ear fluids There are two distinct fluids within the inner ear Perilymph is high in sodium and calcium and low in potassium (similar to CSF) Located between the bony and membranous labyrinth Endolymph is high in potassium and low in sodium and calcium Located within the membranous labyrinth and connected by a series of ducts forming the ductus reuniens and the endolymphatic sac
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Vestibular system Oval window opens into the vestibule Vestibule contains two pouches or sacs utricle & saccule Vestibule also gives rise to the semicircular canals
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Embryo timeline of the vestibular system Wk 4: otocyst forms the vestibular pouches
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