Histology of the Human Ear I. External ear (Figure ... - Faculty.rmc.edu

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II. Middle Ear (Figure 25.1, 25.3, 25.4, 25.5) A. Cavity 1. surrounded by bone of skull 2. dense collagenous connective tissue of skull periosteum 3. thin layer of loose FECT 4. covering of simple cuboidal epithelium B. Ossicles 1. core of bone 2. same wall composition as cavity C. Eustacean tube 1. same wall structure as cavity 2. covering converts to pseudostratified columnar epithelium with goblet cells as the tube approaches the pharynx 2
III. Inner Ear (Figure 25.1, 25.3, 25.7) A. Osseus Labyrinth 1. cavity in temporal bone 2. contains membranous labyrinth 3. also contains perilymphatic fluid space between bone and membranous labyrinth which forms the vestibule and the outer channels of the cochlea (vestibular duct and tympanic duct) 4. areas between bone and fluid spaces filled with loose FECT 5. fluid spaces are lined with simple squamous epithelium B. Membranous Labyrinth 1. lined with simple squamous epithelium in most areas 2. lined with simple columnar epithelium with "hair" cells in sensory areas 3. lined with simple cuboidal or columnar epithelium in fluid production/resorption areas 4. epithelium underlain by loose FECT in most areas C. Sensory Receptor Structures in the Inner Ear (Figure 25.8, 25.9) 1. Common features of receptors a. Sensory receptors in all cases are "hair" cells. (1) "Hair" cells are columnar epithelial cells in the wall of the membranous labyrinth. (2) "Hair" cells have an apical V-shaped array (viewed from the surface) of microvilli. (3) "Hair" cells have either a kinocilium (sensory cilium, found in hair cells in the maculae and the ampullae) or the basal body of a kinocilium (in the hair cells of the Organ of Corti in the cochlea) is located at the apex of the "V" shaped array of microvilli. b. The processes (microvillae) of the hair cells are embedded in gelatinous accessory structures which modify the stimuli (gravity, movement, sound) into mechanical motion of the hair cell processes. 3
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Histology of the Human Ear I. External ear (Figure ... - Faculty.rmc.edu

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