semicircular canal


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Related to semicircular canal: anterior semicircular canal

semicircular canal

n.
Any of three tubular and looped structures of the inner ear, together functioning in maintenance of the sense of balance in the body.

semicircular canal

[-sur′kyələr]
Etymology: L, semi-, half, circulare, to go around, canalis, channel
any of three bony fluid-filled loops in the osseous labyrinth of the internal ear, associated with the sense of balance. The posterior, superior, and lateral canals, all about 0.8 mm in diameter and perpendicular to each other, open into the cochlea. The posterior canal is the longest.
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Semicircular canals

semicircular canal

One of the three perpendicular tubular hollows, each forming two-thirds of a circle, that extend from the vestibule of the labyrinth in the inner ear. The semicircular canals are the bony shells that contain the similarly shaped semicircular ducts, membranous sensory organs that detect the angular acceleration and the orientation of the head.
See also: canal
References in periodicals archive ?
For a small number of patients with intractable posterior canal BPPV surgical occlusion of the semicircular canal is warranted.
9) In their review, these defects were usually located in the external wall of the superior semicircular canal.
5) Abnormalities in cochlear height, horizontal semicircular canal bony island width, and vestibular aqueduct width have correlated well with the presence of hearing loss.
Posterior semicircular canal dehiscence: Value of VEMP and multidetector CT.
Superior semicircular canal dehiscence (SCD) syndrome is a recently recognized condition that is characterized by varying degrees of sound- or pressure-induced vestibular or auditory symptoms.
The cochlea, semicircular canals, and internal auditory canal were normal.
If the hearing has not improved, you are dealing with cochlear otosclerosis or a semicircular canal dehiscence, and the procedure should be terminated.
Schuknecht proposed that BPPV occurs when otoconia irritate the ampulla of the posterior semicircular canal (the cupulolithiasis theory), but other theories exist, as well.
If a patient has a conductive hearing loss and reflexes are present, obtain computed tomography of the temporal bones to rule out superior semicircular canal dehiscence.
An atticotomy is performed for wider exposure; if need be, an atticoantrotomy can be enlarged for a better view of the horizontal semicircular canal (figure 2).
The 1-cm defect in the tegmen tympani was located at the level of the lateral semicircular canal, and it extended to a level anterior to the head of the malleus.
Computed tomography (CT) of the temporal bone (figure 2) showed dehiscence of the superior semicircular canal.