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13 results for “stapes”
Text-fig. 8. Middle-ear ossicles of Metacheiromys marshi, USNM-P 452349. a – left malleus (partial), incus, and stapes in ventral view; b – right malleus in oblique anterior view (left) and oblique posterior view (right). Abbreviations: acr – anterior crus, cb – crus breve, cl – crus longum, fp – footplate, iaf – inferior articular facet, ib – incudal body, lp – lateral process, mh – mallear head, mn – manubrium, mp – muscular process, n – neck, ol – osseous lamina (broken), pcr – posterior crus, sh – stapedial head, stf – stapedial foramen, suaf – superior articular facet. in Skeletal Anatomy Of The Basicranium And Auditory Region In The Metacheiromyid Palaeanodont Metacheiromys (Mammalia, Pholidotamorpha) Based On High-Resolution Ct Scans
Text-fig. 8. Middle-ear ossicles of Metacheiromys marshi, USNM-P 452349. a – left malleus (partial), incus, and stapes in ventral view; b – right malleus in oblique anterior view (left) and oblique posterior view (right). Abbreviations: acr – anterior crus, cb – crus breve, cl – crus longum, fp – footplate, iaf – inferior articular facet, ib – incudal body, lp – lateral process, mh – mallear head, mn – manubrium, mp – muscular process, n – neck, ol – osseous lamina (broken), pcr – posterior crus, sh – stapedial head, stf – stapedial foramen, suaf – superior articular facet.
Text-fig. 7. Metacheiromys marshi, USNM-P 452349, basicranium isosurface from CT scans in oblique ventral view, showing middle ear ossicles as preserved. On the specimen's left side, the ossicles are essentially in life position, with the stapes largely hidden in the fenestra vestibuli; the left malleus is broken and represented largely by the mallear head. On the specimen's right side, most of the floor of auditory bulla has been removed to expose the malleus, which has shifted posteriorly from the life position. Abbreviations: aptt – anteroventral process of tegmen tympani, bo – basioccipital, bs – basisphenoid, eam – squamosal roof of external acoustic meatus, eo – exoccipital, gf – glenoid fossa, i – incus, m – malleus, mh – mallear head, oc – occipital condyle, pr – promontorium of petrosal, sh – stapedial head, tm – part of tubular external acoustic meatus. in Skeletal Anatomy Of The Basicranium And Auditory Region In The Metacheiromyid Palaeanodont Metacheiromys (Mammalia, Pholidotamorpha) Based On High-Resolution Ct Scans
Text-fig. 7. Metacheiromys marshi, USNM-P 452349, basicranium isosurface from CT scans in oblique ventral view, showing middle ear ossicles as preserved. On the specimen's left side, the ossicles are essentially in life position, with the stapes largely hidden in the fenestra vestibuli; the left malleus is broken and represented largely by the mallear head. On the specimen's right side, most of the floor of auditory bulla has been removed to expose the malleus, which has shifted posteriorly from the life position. Abbreviations: aptt – anteroventral process of tegmen tympani, bo – basioccipital, bs – basisphenoid, eam – squamosal roof of external acoustic meatus, eo – exoccipital, gf – glenoid fossa, i – incus, m – malleus, mh – mallear head, oc – occipital condyle, pr – promontorium of petrosal, sh – stapedial head, tm – part of tubular external acoustic meatus.
Anatomy of the neural endocranium and stapes of Diadectes absitus (Diadectomorpha) from the early Permian of Germany based on the high‐resolution X‐ray microcomputed tomography
<p>A detailed anatomy of the braincase and stapes of the subadult specimen of <i>Diadectes absitus</i> from early Permian sediments of Germany based on the high-resolution X-ray microcomputed tomography are described for the first time. In contrast to previous studies of <i>Diadectes</i>, the bones of the braincase (opisthotic, prootic, supraoccipital, basioccipital, exoccipital, basisphenoid, sphenethmoid), and parasphenoid of <i>D. absitus</i> are not co-ossified, but suturally defined. This has allowed for a reconstruction of a complete braincase with all sutures between the individual bones. The opisthotic, prootic, and supraocciptal contain a well-preserved endosseous labyrinth. The 3D-reconstruction of its cavities shows a well-preserved vestibule, three semicircular canals, and well-developed cochlear recess. In addition, a shallow subarcuate fossa is present on the ventral surface of the supraoccipital, which lies medial to the anterior semicircular canal. A typical feature of the diadectid braincase is the presence of the otic tube leading from the fenestra vestibuli to the vestibule. A revision of the topology of this structure is presented here. Here we describe new structures of the stapes, especially in its proximal portion, as well as its position to the fenestra vestibuli. These structures are described for the first time not only in <i>D. absitus</i>, but for the genus.</p>
Data from: Morphology of the petrosal and stapes of Borealestes (Mammaliaformes, Docodonta) from the Middle Jurassic of Skye, Scotland
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Anatomy of the neural endocranium and stapes of Diadectes absitus (Diadectomorpha) from the early Permian of Germany based on the high‐resolution X‐ray microcomputed tomography
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Data from: Oldest known multituberculate stapes suggests an asymmetric bicrural pattern as ancestral for Multituberculata
Middle ear ossicles (malleus, incus, stapes) are known only for few multituberculate taxa, and three different stapedial morphotypes have been suggested: (1) slender, columelliform and microperforate, (2) robust and rod-like, and (3) bicrural. Reinvestigation of Upper Jurassic (Kimmeridgian) mammalian petrosals from the Guimarota coal mine in central Portugal (Western Europe) revealed an asymmetric bicrural stapes (ABS) in the paulchoffatiid Pseudobolodon oreas. The middle ear bones displaced inside the osseous vestibule were detected by a microCT analysis. The Kimmeridgian age of the Guimarota stapes exceeds the stapes from the Early Cretaceous (Barremian) of Asia (about 122-124 ma) by ~30 ma, and is only slightly younger than the stapes of the recently described Oxfordian euharamiyid Arboroharamiya allinhopsoni. The Guimarota stapes indicates that the stapes of Lambdopsalis, described as columelliform and microperforate (small stapedial foramen), does not represent a general condition for multituberculates. The stapes of Pseudobolodon is bicrural, the anterior crus sits centrally on the oval footplate, and the stapedial head is simple and smaller than the footplate. We hypothesize that the ABS evolved from the symmetric bicrural stapes (SBS) of non-mammaliaform cynodonts. The ABS appears to be the ancestral morphotype of the mammalian SBS, and the mammalian columelliform imperforate stapes (CIS).
Surgical and Audiological Outcomes of Endoscopic Stapes Surgery
ClinicalTrials.gov study NCT07304999. IPD Sharing: NO. Countries: 1. Publications: 4.
Ultra-high Resolution CT: the End of Stapes Prosthesis Measurement Misestimation
ClinicalTrials.gov study NCT06323863. IPD Sharing: NO. Countries: 1. Publications: 3.
Data from: Oldest known multituberculate stapes suggests an asymmetric bicrural pattern as ancestral for Multituberculata
Open the record for dataset details and reuse information.
Stapes Footplate Thickness Measured With UHR-CT
ClinicalTrials.gov study NCT05799404. IPD Sharing: NO. Countries: 0. Publications: 2.
Long-Term Results of Bone Cement in Stapes Surgery
ClinicalTrials.gov study NCT06221007. IPD Sharing: NO. Countries: 1. Publications: 0.
The Cost-effectiveness of Stapes Surgery for Otosclerosis Performed Under Local Versus General Anesthesia
ClinicalTrials.gov study NCT06618053. IPD Sharing: NO. Countries: 1. Publications: 0.
Outcome of Stapes Surgery in Otosclerotic Patients With Tinnitus Using Tinnitogram
ClinicalTrials.gov study NCT06022471. IPD Sharing: NO. Countries: 0. Publications: 0.
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