CT-Scan sheep and human inner ear morphometric comparison

Seibel, Valter Ayres; Lavinsky, Luíz; Irion, Klaus

doi:10.1016/s1808-8694(15)30971-x

Cited by 39 publications

(34 citation statements)

References 4 publications

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“…2 and are taken from Purcell et al (2003) and Seibel et al (2006). The middle ear impedance, ZME, is the impedance seen from inside the inner ear at the OW.…”

Section: Contribution From the Inner Earmentioning

confidence: 99%

Model predictions for bone conduction perception in the human

Stenfelt

2016

Hearing Research

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Five different pathways are often suggested as important for bone conducted (BC) sound: (1) sound pressure in the ear canal, (2) inertia of the middle ear ossicles, (3) inertia of the inner ear fluid, (4) compression of the inner ear space, and (5) pressure transmission from the skull interior. The relative importance of these pathways was investigated with an acousticimpedance model of the inner ear. The model incorporated data of BC generated ear canal sound pressure, middle ear ossicle motion, cochlear promontory vibration, and intracranial sound pressure. With BC stimulation at the mastoid, the inner ear inertia dominated the excitation of the cochlea but inner ear compression and middle ear inertia were within 10 dB for almost the entire frequency range of 0.1 to 10 kHz. Ear canal sound pressure gave little contribution at the low and high frequencies, but was around 15 dB below the total contribution at the mid frequencies. Intracranial sound pressure gave responses similar to the others at low frequencies, but decreased with frequency to a level of 55 dB below the total contribution at 10 kHz. When the BC inner ear model was evaluated against AC stimulation at threshold levels, the results were close up to approximately 4 kHz but deviated significantly at higher frequencies. 3 Highlights• A model for BC simulates the contribution from 5 components.• The inner ear compression and inertia and middle ear inertia are most important.• The contribution from intracranial sound pressure is insignificant at higher frequencies.• The model provides similar BM excitation for AC and BC threshold stimulation up to 4 kHz. KeywordsBone conduction, inner ear model, fluid inertia, inner ear compression, middle ear inertia

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“…2 and are taken from Purcell et al (2003) and Seibel et al (2006). The middle ear impedance, ZME, is the impedance seen from inside the inner ear at the OW.…”

Section: Contribution From the Inner Earmentioning

confidence: 99%

Model predictions for bone conduction perception in the human

Stenfelt

2016

Hearing Research

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“…In humans these two anatomical structures can be found on one identical plane only separated by the linea temporalis. A fact that has not been described by other authors before, presumably because they used complete heads in a CT-scan 7 or focused especially to the middle ear. Another special formation is the big bullous hypotympanon.…”

Section: Outer Morphologymentioning

confidence: 95%

“…Most sizes are smaller, which is a challenge for trainees. As a lot of morphology is similar, these bones might be used for teaching anatomy and surgical techniques as others described before 2,5,7 . The most common alternative to human temporal bones are virtual trainers based on CT-scans of human temporal bones 9,10 .…”

Section: General Viewmentioning

confidence: 99%

Anatomia do osso temporal de ovelhas sob aspectos didáticos

Gurr¹,

Pearson²,

Dazert³

2011

Braz. j. otorhinolaryngol. (Impr.)

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Human temporal bones in teaching ear surgery are rare. The lamb's temporal bone might be a possible alternative. Material and Methods:Temporal bones of the lamb were dissected with a typical temporal bone lab drilling program. We included a mastoidectomy, endaural approaches, but also analyzed the outer appearance, the external ear canal and the hypotympanon. Some steps differed from preparation done in humans. The morphometric results were compared to the known anatomy of human in order to verify the lambs` temporal bone for suitability in otosurgic training. Results:The lambs' temporal bone appears smaller than the human one. We found a bullous extended hypotympanon located under the external ear canal. The tympanic membrane is very similar to the human one. The external ear canal is smaller and shorter. The ossicular chain shows analogies to human one.Discussion: This study shows, that especially the middle ear, the tympanic membrane and the external ear canal are morphologically equal to the structures found in human temporal bones. The lamb seems feasible for teaching the anatomy of the ear. The smaller scales of some structures, especially the outer components of the temporal bone are a disadvantage. Conclusions:The lamb seems to be an alternative in teaching ear surgery. Braz J Otorhinolaryngol. 2011;77(1):51-7. ORIGINAL ARTICLE BJORL

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“…Borin et al reported that the marmoset monkey model they investigated was appropriate for use in research on primates, whereas Gurr et al (2010) reported that temporal bone dissections in pig cadavers were very helpful in otosurgical education and training. Seibel et al (2006a) aimed to develop a model from anatomical samples obtained from sheep for use in otology training and experimental surgery, and underlined the necessity for alternative and creative models that would enable surgeons to improve their operative skills. Bovine fetuses are considered to be advantageous in that they are a low-cost slaughterhouse material, easy to both obtain and manipulate.…”

Section: Anatomy and Arterial Supply Of Ear In Fetusesmentioning

confidence: 99%

“…Some of the studies regarding ear morphology of animals were carried out to reveal functional roles of ear especially in fossorial rodents (Lange et al, 2004;Lange and Burda, 2005;Mason, 2006), and some other studies (Pracy et al, 1998;Seibel et al, 2006a;Borin et al, 2008) made morphological comparisons to humans. To understand the anatomic problems and vascular diseases, certain techniques like radiography, ultrasonography, computed tomography, and magnetic resonance were applied to animals as well, and carnivores (e.g., cats, dogs) were frequently used for this purpose (Allgoewer et al, 2000;Russo et al, 2002;Eom et al, 2008).…”

mentioning

confidence: 99%

Gross anatomy and arterial vascularization of the tympanic cavity and osseous labyrinth in mid‐gestational bovine fetuses

Erdoğan

Kılınç

2010

The Anatomical Record

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This study aims to determine morphological features of certain aural formations, varietal characteristics, and arterial supply in fetal development period in cattle. For this purpose, ears of 10 bovine fetuses in mid-gestation were evaluated. Organ morphology and vascularization in prenatal life were investigated by using corrosion cast technique. It was observed that some aspects of osseous formation and vascular organization in middle and inner ears were not developed completely in the first half of gestation; in addition, cochlea did not its snail-like structure yet, lateral semicircular canal was rather low compared to others and auditory ossicles did not take its final shape. The feeding blood vessels of inner ear were found to demonstrate three different distribution patterns, whereas feeding pattern in middle ear was very similar in many specimens. The presence of stapedial artery was also identified. Differences and similarities with other some species were assessed in terms of both general morphological structure and vascular organization. From this regard, it is thought that this study will constitute a comparative model for both humans and other species and provide morphological contributions since there is not sufficient literature on species-specific ear morphology in the field of veterinary anatomy in contrast to the abundance of studies on humans. Anat Rec, 293:2083Rec, 293: -2093

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CT-Scan sheep and human inner ear morphometric comparison

Abstract: The results of this morphometric study of sheep ear are an important contribution to the development of an animal model to be used for surgical training and experimental otologic surgeries.

Cited by 39 publications

References 4 publications

Model predictions for bone conduction perception in the human

Model predictions for bone conduction perception in the human

Anatomia do osso temporal de ovelhas sob aspectos didáticos

Gross anatomy and arterial vascularization of the tympanic cavity and osseous labyrinth in mid‐gestational bovine fetuses

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