Structural, physical, chemical and micromechanical properties capsules labyrinths of an internal ear are studied at influence of the shock wave caused by wound of a head by not lethal kinetic weapon. It is established, that under the influence of a shock wave in bone plates capsules labyrinths processes remodeling, and accompanied osteolysis amplify. Hydroxyapatites capsules labyrinths tests polymorphic phase transitions and depending on an initial condition is exposed amorphizationor increases the crystallinity. As a result of change of micromechanical properties in capsules labyrinths there are cracks, ruptures matrix and bone cavities.
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J Vis Exp
November 2024
Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins University School of Medicine.
The living human inner ear is challenging to study because it is encased within dense otic capsule bone that limits access to biological tissue. Traditional temporal bone histopathology methods rely on lengthy, expensive decalcification protocols that take 9-10 months and reduce the types of tissue analysis possible due to RNA degradation. There is a critical need to develop methods to access fresh human inner ear tissue to better understand otologic diseases, such as Ménière's disease, at the cellular and molecular level.
View Article and Find Full Text PDFHear Res
January 2025
Department of Neuroscience, Erasmus Medical Center, Rotterdam, the Netherlands.
Beginning in 2006, optical coherence tomography (OCT) has been adapted for use as a vibrometer for hearing research. The application of OCT in this field, particularly for studying cochlear mechanics, represents a revolutionary advance over previous technologies. OCT provides detailed evidence of the motions of components within the organ of Corti, extending beyond the first-encountered surface of observation.
View Article and Find Full Text PDFFront Neurol
October 2024
Department of Head and Neck Surgery & Communication Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, United States.
Background: Superior semicircular canal dehiscence (SSCD) is a vestibular-cochlear disorder in humans in which a pathological third mobile window of the otic capsule creates changes to the flow of sound pressure energy through the perilymph/endolymph. The primary symptoms include sound-induced dizziness/vertigo, inner ear conductive hearing loss, autophony, headaches, and visual problems. We have developed an animal model of this human condition in the Mongolian Gerbil that uses surgically created SSCD to induce the condition.
View Article and Find Full Text PDFRev Med Suisse
October 2024
Service d'ORL et de chirurgie cervicofaciale, Hôpitaux universitaires de Genève, 1211 Genève 14.
J Anat
September 2024
Paläontologische Sammlung, Senckenberg Centre for Human Evolution and Palaeoenvironment (SHEP) an der Universität Tübingen, Tübingen, Germany.
Whereas mammals are characterized by the presence of three middle ear ossicles, reptiles have only one, the columella (stapes). Nevertheless, there is a great diversity of columellar anatomy among sauropsids, especially in the unique and cartilaginous "extracolumella"-portion. Molecular studies revealed the "columella" of chicken and quails to be formed within the second pharyngeal arch, although conflicting evidence exists for the columellar footplate and distal parts of the columella in these birds.
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