otic capsule


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otic capsule

[′ōd·ik ′kap·səl]
(embryology)
A cartilaginous capsule surrounding the auditory vesicle during development, later fusing with the spheroid and occipital cartilages.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Entry of substances into perilymph through the bone of the otic capsule after intratympanic applications in guinea pigs: implications for local drug delivery in humans.
adult population, otosclerosis is a primary degenerative idiopathic osteodystrophy of the osseous otic capsule that most commonly affects Caucasians in young to middle adulthood.
High-resolution computed tomography (HRCT) showed a non-depressed occipital cranial fracture line that spared the otic capsule and temporal bone (Figure 1).
Any part of the otic capsule can be involved, with a predilection for a number of different sites, (3) most commonly anterior to the oval window, at the margins of the round window, and the apical-medial wall of the cochlea.
The taenia marginalis extends between the pila accessoria and the dorsal surface of the otic capsule. In the occipital region, the otic capsule is very conspicuous and presents the crista parotica.
Otosclerosis: An inflammatory disease of the otic capsule of viral etiology.
Since the first report of otic capsule dehiscence in patients with superior semicircular canal dehiscence (SSCD) by Minor in 1998 [1], different types of otic capsule dehiscence restricted to the cochlea have been described: cochlear--carotid, cochlear--internal auditory canal, or cochlear--facial dehiscence [2].
The underlying pathologic processes involved in otosclerosis can affect various parts of the otic capsule, but the fissula ante fenestram is the most commonly involved area.
The petrous bone may be hypoplastic whereas the otic capsule may be hypoplastic or aplastic (4).
The inner ear consists of the cochlea, vestibule and semicircular canals encased in the bony otic capsule. The air-filled middle ear and fluid-filled inner ear are connected by two membrane-covered openings--the oval and round windows.
The hearing loss is caused by a change in the bone mineral density of the otic capsule. This mechanism explains the characteristic high frequency sensorineural hearing loss with air bone gap.