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A, Representation of the human inner ear. The mammalian ear is composed of three compartments: the outer ear made up of the auricle and external
auditory canal; the middle ear made up of the ossicles within the tympanic cavity; and the inner ear which consists of six sensory organs, namely the five
vestibular end organs (saccule, utricle, and three semicircular canals) and the cochlea. B, Cross-section through the cochlear duct. The membranous
labyrinth of the cochlea (cochlear duct) divides the bony labyrinth into three canals: the scala vestibuli and the scala tympani, both filled with perilymph,
and the scala media, filled with endolymph. The organ of Corti, which is the auditory transduction apparatus, protrudes in the scala media. This organ is
made up of (a) an array of sensory cells, that is, the single row of inner hair cells (ihc) and three rows of outer hair cells (ohc), and (b) different types of
Source: Hereditary Hearing Loss, The Online Metabolic and Molecular Bases of Inherited Disease
supporting cells (p, d, h). An acellular gel, the tectorial membrane, covers it. The organ of Corti is flanked by the epithelial cells of the inner sulcus (is) on
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Valle
Beaudet AL,
Kinzlerside.
KW,The
Antonarakis
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A, Gibson
K, Mitchell
The Online
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secretion of K into the endolymph. Different types of fibrocytes surround the cochlear epithelium. Other abbreviations are: i = interdental cells; p = pillar
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cells; d = Deiter's
cells;©h2017
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sp = spiralAll
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(Modified from Kalatzis V, Petit C.35 Used with permission.). C, Representation of a
sensory inner hair cell. Note the highly organized hair bundle, made of several rows of stereocilia, at the apical pole of the cell. The ribbon synapse has