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Results for “Oval Window, Ear”

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At least 163 records · Page 9Linked to original sources
PubMed1991

Anatomic variations and anomalies involving the facial canal.

Congenital bony dehiscences in the facial canal result from incomplete closure during development and are observed in approximately 55% of temporal bones. Anomalies involving the facial canal frequently are encountered in malformations of the temporal bone. These anomalies include aberrations of the course of one or all of the segments of the canal; abnormal relation to the oval and round window; bifurcations and trifurcations of the nerve; and associations with dysplasia of the stapes, oval window, external ear canal, and auricle. Rarely, the facial nerve may be hypoplastic or totally absent. Two abnormal vessels occasionally may accompany the facial nerve in the Fallopian canal: a persistent stapedial artery and a persistent lateral capital vein.

Chorda Tympani Nerve↗
PubMed1991

[Our surgical experience of 20 extracochlear implantations on the oval window with transcutaneous approach].

While multichannel implants can produce far better results than single-channel implants, the results of a multichannel implantation are impossible to predict accurately preoperatively. Single-channel implants, which produce average and constant results, still have a major merit in that their cost is much lower. Since extracochlear implantation with transcutaneous approach is innocuous, we have been promoting this type of implantation as a temporary procedure until much more effective systems are found in the future, or as a definitive implantation.

Deafness↗
PubMed1991

Elastic-related fibers in the annular ligament of the stapes-oval window articulation. An electron microscopic and histochemical study in the rat and the rabbit.

The annular ligament that attaches the circumference of the base of the stapes to the margin of the oval window (fenestra vestibuli) was stained with selective methods for elastic system fibers and was also studied at the ultrastructural level after tannic acid-glutaraldehyde fixation. Although the annular ligament is devoid of elastic fibers, it is rich in elastic-related fibers (i.e. = oxytalan and elaunin fibers). Elaunin fibers predominate in the annular ligament itself and they are continuous with the oxytalan fibers which are embedded in the matrix of the articular cartilage.

Animals↗
PubMed1990

[Pneumolabyrinth and perilymphatic fistula after stapedectomy].

A case of per-surgery discovery of a pneumolabyrinth referred to the oval window is reported. Such was associated with a post-stapedectomy perilymphatic fistula. Revealing clinical signs were invalidating vertigo, transmission-type hearing loss, and tinnitus. Surgical plugging of the fistula caused the dizziness spells to regress completely, as well as improving tinnitus and restoring hearing markedly. Literature data confirm the fact that pneumolabyrinths are always associated with perilymphatic fistulas. Moreover, pneumolabyrinths seem to play an important role in the genesis of cochlear signs accompanying perilymphatic fistulas.

Adult↗
PubMed1988

Correlation of high-resolution computed tomography and gross anatomic sections of the temporal bone: II. Vestibular apparatus.

High-resolution computed tomography (CT) of isolated temporal bones was performed in the transaxial, coronal, and sagittal planes at 1.5-mm intervals. The temporal bones were then sectioned at 2.0-mm intervals in planes parallel to the CT scans. The structures making up the vestibular apparatus were identified, and the planes in which each is best visualized were selected for the illustrations. The vestibule, oval window, tympanic cavity, and tympanic portion of the facial nerve are best seen in the transaxial and coronal planes; the arch of the superior semicircular canal in the transaxial plane and its limbs in the coronal plane; the arch of the posterior semicircular canal in the coronal and sagittal planes and its limbs in the transaxial plane; and the common crus in the sagittal plane. The horseshoe-shaped lateral semicircular canal is displayed in the transaxial plane, and the relationship of its lateral limb to the tympanic segment of the facial nerve is best demonstrated in the sagittal plane. The ampullae of all three canals can be appreciated equally well in all three planes.

Humans↗
PubMed1987

Perilymph fistula resulting from microfissures.

Perilymphatic fistulas are well documented in the otolaryngologic literature as a cause for both auditory and vestibular symptoms. The anatomic location of fistulas has been clinically confirmed in both the oval and round windows. Furthermore, membranous tears within the cochlea have been described post mortem and may be the cause of the remaining fistulas which are suspected but not confirmed surgically. A fourth source of perilymph fistula has previously been suggested by Okano and Harada. During the past several years, surgical confirmation of perilymph leakage from two microfissure areas has been observed. These cases will be briefly discussed along with their clinical implications. Speculation as to the type of hearing loss caused by fistulas will be offered. Hypotheses concerning the various symptoms encountered in patients and the location of the defect will also be addressed.

Adult↗
PubMedDate not supplied

Otosclerosis: comparison of complex-motion tomography and computed tomography.

A prospective computed tomographic and complex-motion tomographic evaluation was performed in 18 suspected or proven cases of otosclerosis. Although there was good agreement between both methods, there was no greater diagnostic accuracy with computed tomography. However, computed tomography demonstrated the changes better than complex-motion tomography.

Evaluation Studies as Topic↗
PubMed1984

Bilateral congenital oval window microfistulae in a mother and son.

This article details case histories of a son and his mother who were studied over a seven-year period before making the diagnosis of bilateral oval window microfistulae in both of them. The boy demonstrated a slowly progressive bilateral and symmetrical sensorineural hearing loss closely resembling that of his mother. The case reports emphasize their respective histories, diagnostic evaluation, surgical observations, and treatment.

Adult↗
PubMedDate not supplied

[Aplasia of the oval window and the fallopian aqueduct. Cure of deafness by an attico-vestibular piston (3 cases) (author's transl)].

This is a report on three operations for congenital deafness in a brother and a sister, presenting with a malposition of the facial nerve, and an aplasia of the aqueduct of Fallope and the oval window. A full restitution of hearing was obtained by a vestibular-attico teflon piston. The result is of more than ten years standing now for the older of the two cases.

Abnormalities, Multiple↗