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Anatomy - 7

Anatomy - 7 - Anatomy of the inner ear Part 2 the cochlea...

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Anatomy of the inner ear Part 2: the cochlea
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Hearing Mechanism (cochlea) Saccule is continuous with the cochlea Cochlea houses the organ of hearing Oval window opens into the cochlea via the scala vestibuli which is a channel off the vestibule
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Embryo timeline of the cochlea Wk 3: otic placode appears Wk 6: Cochlea has ½ turn Wk 7: 1 ¼ turns – 1 st sign of hair cells Wk 8: 1 ½ turns Wk 9: cochlea 2 ½ turns but only 20mm long Wk 16: cochlea 33-37mm long Wk 20: membranes formed Wk 22: hair cells adult configuration Wk 25: organ of corti close to adult form & fetus has rudimentary hearing Wk 32: cochlea is adult structure
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Hearing mechanism The cochlea houses the organ of hearing 9mm wide at base (tapers) by 5mm high The basal end includes the oval & round windows The apical end includes the helicotrema (share fluids) Contains 3 ducts or channels Scala vestibuli (perilymph) Scala media or cochlear duct (endolymph) Scala tympani (perilymph)
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Scala vestibuli Begins at the oval window Filled with perilymph Superior wall is bony labyrinth Inferior is Reissner’s membrane Ends at the apex where the helicotrema allows fluid to be shared with the scala tympani
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Scala tympani Lower channel of the cochlea begins at the apex Filled with perilymph that is continuous with the scala vestibuli via the helicotrema Ends at the round window Superior wall is the basilar membrane Inferior wall is the bony labyrinth
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  • Fall '16
  • basilar membrane, hair cells, scala media, scala vestibuli

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