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C. L. Mahajan - One of the best experts on this subject based on the ideXlab platform.
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Sisor rabdophorus—A study in adaptation and natural relationship: II. The interrelationship of the gas bladder, Weberian apparatus, and Membranous Labyrinth
Journal of Zoology, 2009Co-Authors: C. L. MahajanAbstract:A detailed description of the gas bladder, the Weberian apparatus and the Membranous Labyrinth in Sisor rabdophorus is given. It has been shown that these structures show a number of specializations which can be correlated with the bottom-living habits of the fish. Evidence has been brought forth to show that the Weberian mechanism continues to serve as an aid to hearing. It has been concluded that Gunther's inclusion of Sisor in the group Hypostomatina along with certain loricariid and callichthyid genera is not a natural one and that Regan's (1911) and Berg's (1940) family Sisoridae is more indicative of natural relationships. That Sisor diverged early from the main stem of sisorid evolution, is further supported by this study.
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sisor rabdophorus a study in adaptation and natural relationship ii the interrelationship of the gas bladder weberian apparatus and Membranous Labyrinth
Journal of Zoology, 2009Co-Authors: C. L. MahajanAbstract:A detailed description of the gas bladder, the Weberian apparatus and the Membranous Labyrinth in Sisor rabdophorus is given. It has been shown that these structures show a number of specializations which can be correlated with the bottom-living habits of the fish. Evidence has been brought forth to show that the Weberian mechanism continues to serve as an aid to hearing. It has been concluded that Gunther's inclusion of Sisor in the group Hypostomatina along with certain loricariid and callichthyid genera is not a natural one and that Regan's (1911) and Berg's (1940) family Sisoridae is more indicative of natural relationships. That Sisor diverged early from the main stem of sisorid evolution, is further supported by this study.
Kimitaka Kaga - One of the best experts on this subject based on the ideXlab platform.
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Vestibular Aging Process from 3D Physiological Imaging of the Membranous Labyrinth
Scientific Reports, 2020Co-Authors: Hisaya Tanioka, Sayaka Tanioka, Kimitaka KagaAbstract:There is no three-dimensional (3D) technique to study the microanatomical structures of the in vivo 3D vestibular Membranous Labyrinth. Recent two MRI methods using a contrast agent can only depict the low-resolution imaging of endolymphatic hydrops. Therefore, we provide the new precise volume rendering algorithms to create the in vivo 3D vestibular Membranous Labyrinth images from high-resolution temporal bone low-dose CT data. We also ascertain whether the created 3D microstructure images are reliable in anatomical findings. Secondary, we will analyze the age-related changes of the vestibular Membranous Labyrinth. These created 3D Membranous vestibular images were almost consistent with the appearance, dimensions, areas, and angles from those acquired in previous histological works. The age-related image changes showed the enlarged saccule in females, the enlarged utricle in males, and the dilated tendency of the lateral semicircular duct. These results may correlate to the findings of the previous physiological works on cervical and ocular vestibular evoked myogenic potentials, and gait studies. The age-related balance disorders may be associated with the enlargement of each Membranous organ in the vestibule. This new imaging technique now enables visualizing microanatomical changes in the in vivo Membranous vestibulum, and these created 3D images may suggest physiological information.
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morphological features of the Membranous Labyrinth in meniere s disease
Otolaryngology-Head and Neck Surgery, 2013Co-Authors: Hisaya Tanioka, Kimitaka Kaga, Sayaka TaniokaAbstract:Objectives:Vertigo, the sensation of motion without true motion, is secondary to lesions or dysfunction within vestibular systems. The aim of this study was to determine morphological features within the vestibular systems and cochlear duct in Meniere’s disease.Methods:Three patients who were diagnosed with Meniere’s disease were enrolled. Two cases were studied in attack and recovery period. One case was followed by pre-attack, attack and recovery period. Axial temporal thin sectional computed tomography (CT) data were applied to create 3D volume rendering Membranous images on the CT work station for post processing with the use of current software.Results:In attack period, the saccule, utricle and cochlear duct were enlarged in comparison with pre-attack and recovery period. Also, we could see thickening changing features of ductus reuniens, saccular duct, and utricular duct during attack period.Conclusions:We can evaluate conditions of the Membranous Labyrinth in Meniere’s disease. The pathological ima...
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Morphological Features of the Membranous Labyrinth in Ménière‘s Disease:
Otolaryngology–Head and Neck Surgery, 2013Co-Authors: Hisaya Tanioka, Kimitaka Kaga, Sayaka TaniokaAbstract:Objectives:Vertigo, the sensation of motion without true motion, is secondary to lesions or dysfunction within vestibular systems. The aim of this study was to determine morphological features within the vestibular systems and cochlear duct in Meniere’s disease.Methods:Three patients who were diagnosed with Meniere’s disease were enrolled. Two cases were studied in attack and recovery period. One case was followed by pre-attack, attack and recovery period. Axial temporal thin sectional computed tomography (CT) data were applied to create 3D volume rendering Membranous images on the CT work station for post processing with the use of current software.Results:In attack period, the saccule, utricle and cochlear duct were enlarged in comparison with pre-attack and recovery period. Also, we could see thickening changing features of ductus reuniens, saccular duct, and utricular duct during attack period.Conclusions:We can evaluate conditions of the Membranous Labyrinth in Meniere’s disease. The pathological ima...
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3D Imaging of the Membranous Labyrinth: Normal Anatomy and Pathological Conditions
Otolaryngology–Head and Neck Surgery, 2011Co-Authors: Hisaya Tanioka, Kimitaka KagaAbstract:Objective: The standard for studying temporal bone anatomy has been histopathological sectioning for microtome following chemical fixation and deossification of the temporal bone specimen. We can directly synthesize the Membranous Labyrinth from the conventional CT exam. We evaluated normal anatomy and pathological conditions of the Membranous Labyrinth.Method: We studied 20 normal subjects, 20 hyperlipidemias, 20 DMs, 4 Meniere diseases, and 2 congenital malformations. To develop a 3D reconstructed image of the Membranous Labyrinth based on HR-CT, the axial data were applied to create 3D images on the CT work station for postprocessing with factory presets.Results: 3D visualization of different structures of the Membranous Labyrinth allowed display of correct anatomy of high detail in all normal subjects. We could observe the cochlear duct, ductus reuniens, saccule, utricle, and ampullae. Otherwise, pathological conditions were revealed as irregular shape of the cochlear duct and/or small or large saccul...
Hisaya Tanioka - One of the best experts on this subject based on the ideXlab platform.
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Vestibular Aging Process from 3D Physiological Imaging of the Membranous Labyrinth
Scientific Reports, 2020Co-Authors: Hisaya Tanioka, Sayaka Tanioka, Kimitaka KagaAbstract:There is no three-dimensional (3D) technique to study the microanatomical structures of the in vivo 3D vestibular Membranous Labyrinth. Recent two MRI methods using a contrast agent can only depict the low-resolution imaging of endolymphatic hydrops. Therefore, we provide the new precise volume rendering algorithms to create the in vivo 3D vestibular Membranous Labyrinth images from high-resolution temporal bone low-dose CT data. We also ascertain whether the created 3D microstructure images are reliable in anatomical findings. Secondary, we will analyze the age-related changes of the vestibular Membranous Labyrinth. These created 3D Membranous vestibular images were almost consistent with the appearance, dimensions, areas, and angles from those acquired in previous histological works. The age-related image changes showed the enlarged saccule in females, the enlarged utricle in males, and the dilated tendency of the lateral semicircular duct. These results may correlate to the findings of the previous physiological works on cervical and ocular vestibular evoked myogenic potentials, and gait studies. The age-related balance disorders may be associated with the enlargement of each Membranous organ in the vestibule. This new imaging technique now enables visualizing microanatomical changes in the in vivo Membranous vestibulum, and these created 3D images may suggest physiological information.
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The Membranous Labyrinth in vivo from high-resolution Temporal CT data
2018Co-Authors: Hisaya TaniokaAbstract:A prerequisite for the modeling and understanding of the inner ear mechanics needs the accurate created Membranous Labyrinth. I present a semi-automated methodology for accurate reconstruction of the Membranous Labyrinth in vivo from high-resolution temporal bone CT data of normal human subjects. I created the new technique which was combined with the segmentation methodology, transparent, thresholding, and opacity curve algorithms. This technique allowed the simultaneous multiple image creating without any overlapping regions in the inner ear has been developed. The reconstructed 3D images improved the Membranous Labyrinth geometry to realistically represent physiologic dimensions. These generated Membranous structures were in good agreement with the published ones, while this approach was the most realistic in terms of the Membranous Labyrinth. The precise volume rendering depends on proprietary algorithms so that different results can be obtained, and the images appear qualitatively different. For each anatomical question, a different visualization technique should be used to obtain an optimal result. All scientists can create the Membranous Labyrinth in vivo in real time like a retinal camera.
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morphological features of the Membranous Labyrinth in meniere s disease
Otolaryngology-Head and Neck Surgery, 2013Co-Authors: Hisaya Tanioka, Kimitaka Kaga, Sayaka TaniokaAbstract:Objectives:Vertigo, the sensation of motion without true motion, is secondary to lesions or dysfunction within vestibular systems. The aim of this study was to determine morphological features within the vestibular systems and cochlear duct in Meniere’s disease.Methods:Three patients who were diagnosed with Meniere’s disease were enrolled. Two cases were studied in attack and recovery period. One case was followed by pre-attack, attack and recovery period. Axial temporal thin sectional computed tomography (CT) data were applied to create 3D volume rendering Membranous images on the CT work station for post processing with the use of current software.Results:In attack period, the saccule, utricle and cochlear duct were enlarged in comparison with pre-attack and recovery period. Also, we could see thickening changing features of ductus reuniens, saccular duct, and utricular duct during attack period.Conclusions:We can evaluate conditions of the Membranous Labyrinth in Meniere’s disease. The pathological ima...
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Morphological Features of the Membranous Labyrinth in Ménière‘s Disease:
Otolaryngology–Head and Neck Surgery, 2013Co-Authors: Hisaya Tanioka, Kimitaka Kaga, Sayaka TaniokaAbstract:Objectives:Vertigo, the sensation of motion without true motion, is secondary to lesions or dysfunction within vestibular systems. The aim of this study was to determine morphological features within the vestibular systems and cochlear duct in Meniere’s disease.Methods:Three patients who were diagnosed with Meniere’s disease were enrolled. Two cases were studied in attack and recovery period. One case was followed by pre-attack, attack and recovery period. Axial temporal thin sectional computed tomography (CT) data were applied to create 3D volume rendering Membranous images on the CT work station for post processing with the use of current software.Results:In attack period, the saccule, utricle and cochlear duct were enlarged in comparison with pre-attack and recovery period. Also, we could see thickening changing features of ductus reuniens, saccular duct, and utricular duct during attack period.Conclusions:We can evaluate conditions of the Membranous Labyrinth in Meniere’s disease. The pathological ima...
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3D Imaging of the Membranous Labyrinth: Normal Anatomy and Pathological Conditions
Otolaryngology–Head and Neck Surgery, 2011Co-Authors: Hisaya Tanioka, Kimitaka KagaAbstract:Objective: The standard for studying temporal bone anatomy has been histopathological sectioning for microtome following chemical fixation and deossification of the temporal bone specimen. We can directly synthesize the Membranous Labyrinth from the conventional CT exam. We evaluated normal anatomy and pathological conditions of the Membranous Labyrinth.Method: We studied 20 normal subjects, 20 hyperlipidemias, 20 DMs, 4 Meniere diseases, and 2 congenital malformations. To develop a 3D reconstructed image of the Membranous Labyrinth based on HR-CT, the axial data were applied to create 3D images on the CT work station for postprocessing with factory presets.Results: 3D visualization of different structures of the Membranous Labyrinth allowed display of correct anatomy of high detail in all normal subjects. We could observe the cochlear duct, ductus reuniens, saccule, utricle, and ampullae. Otherwise, pathological conditions were revealed as irregular shape of the cochlear duct and/or small or large saccul...
J. Morris - One of the best experts on this subject based on the ideXlab platform.
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REVIEW ARTICLE State of the Art: 3T Imaging of the Membranous Labyrinth
2015Co-Authors: John I. Lane, B. Bolster, M A Bernstein, Robert J Witte, K. Johnson, J. MorrisAbstract:SUMMARY: This article reviews the anatomy of the Membranous Labyrinth and demonstrates the ability of high-resolution MR imaging at 3T to visualize the neurosensory epithelium by using the latest fast spin-echo techniques. Visualization of the Membranous structures of the inner earhasbeen limited to thedetectionofnormal fluid signal inten-sity within the bony Labyrinth on 1.5T or 3T MR imaging. The ability todirectly visualize the endolymphatic vesicles of the inner ear might permit the development of imaging criteria in the di-agnosis and treatment of Labyrinthine disease. Currently 3D se-quences to include constructive interference in the steady state (CISS) or fast spin-echo (FSE) techniques provide excellent de-piction of the nerves within the internal auditory canal as well as the fluidwithin the Labyrinth, but attempts to imageorgansof the Membranous Labyrinthhavebeen compromisedby susceptibility banding artifact in the case of gradient-echo acquisitions and im-age blurring inherent to fast spin-echo (FSE) sequences.1 In thi
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State of the Art: 3T Imaging of the Membranous Labyrinth
American Journal of Neuroradiology, 2008Co-Authors: John I. Lane, B. Bolster, M A Bernstein, Robert J Witte, K. Johnson, J. MorrisAbstract:This article reviews the anatomy of the Membranous Labyrinth and demonstrates the ability of high-resolution MR imaging at 3T to visualize the neurosensory epithelium by using the latest fast spin-echo techniques.
Lucia Mancini - One of the best experts on this subject based on the ideXlab platform.
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Enhanced contrast in X-ray microtomographic images of the Membranous Labyrinth using different X-ray sources and scanning modes.
Journal of anatomy, 2018Co-Authors: Jana Goyens, Menelia Vasilopoulou-kampitsi, Raf Claes, Jan Sijbers, Lucia ManciniAbstract:The vestibular system, located in the inner ear, plays a crucial role in balance and gaze stabilisation by sensing head movements. The interconnected tubes with Membranous walls of the vestibular system are located in the skull bone (the 'Membranous Labyrinth'). Unfortunately, these membranes are very hard to visualise using three-dimensional (3D) X-ray imaging techniques. This difficulty arises due to the embedment of the membranes in the dense skull bone, the thinness of the membranes, and the small difference in X-ray absorption between the membranes and the surrounding fluid. In this study, we compared the visualisation of very small specimens (lizard heads with vestibular systems smaller than 3 mm) by X-ray computed micro-tomography (μCT) based on synchrotron radiation and conventional sources. A visualisation protocol using conventional X-ray μCT would be very useful thanks to the ease of access and lower cost. Careful optimisation of the acquisition parameters enables detection of the membranes by using μCT scanners based on conventional microfocus sources, but in some cases a low contrast-to-noise ratio (CNR) prevents fast and reliable segmentation of the membranes. Synchrotron radiation μCT proved to be preferable for the visualisation of the small samples with very thin membranes, because of their high demands for spatial and contrast resolution. The best contrast was obtained by using synchrotron radiation μCT working in phase-contrast mode, leading to up to twice as high CNRs than the best conventional μCT results. The CNR of the synchrotron radiation μCT scans was sufficiently high enough to enable the construction of a 3D model by the means of semi-automatic segmentation of the Membranous Labyrinth. Membrane thickness was found to range between 2.7 and 36.3 μm. Hence, the minimal membrane thickness was found to be much smaller than described previously in the literature (between 10 and 50 μm).