Semicircular Canal Size and Shape Influence on Disorientation

Cheung, Bob; Ercoline, William R.

doi:10.3357/amhp.5104.2018

Cited by 6 publications

(4 citation statements)

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“…In the current study, the inner ears of piscivorous species were characterised by relatively small semi-circular canals and ampullae compared to non-piscivores. This contradicts evidence from other vertebrate groups, which predicts piscivores that feed off the substrate should possess relatively large semi-circular canal diameters to facilitate the vestibular requirements associated with catching agile prey in an open water environment, similar to birds that perform highly agile aerial manoeuvres 75 . Alternatively, the structurally homogenous open-water environments that many piscivorous sharks feed in (excluding reef-associated species) may reduce the need for more nuanced vestibular cues compared to fishes that must manoeuvre their bodies throughout more complex habitats (e.g., obstacles, shelters, crevices) 76 .…”

Section: Discussioncontrasting

confidence: 65%

“…In mammals, the size of the semi-circular canals is correlated with afferent sensitivity 72 . Further, mammals 71 , birds 75 , and salamanders 108 show correlations between semi-circular canal dimensions and locomotor agility. In fishes, however, links between semi-circular canal dimensions and locomotor behaviour are lacking.…”

Section: Discussionmentioning

confidence: 94%

“…The diameter of the each canal duct is thought to positively scale with the radius of curvature 59 , while both canal diameter and radius of curvature correlate positively with sensitivity across vertebrates 59 , 72 , 73 . In mammals and birds, the size of the semi-circular canals (i.e., canal diameter and radius of curvature) is also positively correlated with locomotor behaviour, with more agile species having larger semi-circular canals 71 , 74 , 75 . However, such a relationship has not been established in fishes, which have larger semi-circular canals relative to their body size than other vertebrate groups 59 , and possess a comparatively restricted ability to make swift head movements 76 .…”

Section: Discussionmentioning

confidence: 99%

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Quantitative assessment of inner ear variation in elasmobranchs

Sauer¹,

Radford²,

Mull³

et al. 2023

Sci Rep

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Considerable diversity has been documented in most sensory systems of elasmobranchs (sharks, rays, and skates); however, relatively little is known about morphological variation in the auditory system of these fishes. Using magnetic resonance imaging (MRI), the inner ear structures of 26 elasmobranchs were assessed in situ. The inner ear end organs (saccule, lagena, utricle, and macula neglecta), semi-circular canals (horizontal, anterior, and posterior), and endolymphatic duct were compared using phylogenetically-informed, multivariate analyses. Inner ear variation can be characterised by three primary axes that are influenced by diet and habitat, where piscivorous elasmobranchs have larger inner ears compared to non-piscivorous species, and reef-associated species have larger inner ears than oceanic species. Importantly, this variation may reflect differences in auditory specialisation that could be tied to the functional requirements and environmental soundscapes of different species.

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Section: Discussioncontrasting

confidence: 65%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

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Quantitative assessment of inner ear variation in elasmobranchs

Sauer¹,

Radford²,

Mull³

et al. 2023

Sci Rep

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“…The bony labyrinth comprises of the vestibule, cochlea and semicircular canals 10 . The semicircular canals are divided into the anterior semicircular canal, posterior semicircular canal and lateral semicircular canal 11 . The lateral semicircular canal opens in the vestibule, while the anterior semicircular canal and posterior semicircular canal form the common crus before entering the vestibule 12 .…”

Section: Microsurgical Anatomical Structures Of Iacmentioning

confidence: 99%

A hearing preservation technique for acoustic neuroma resection via retrosigmoid sinus approach

Zeng

Chen

et al. 2023

Preprint

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Background: Acoustic neuroma, also known as vestibular schwannoma, is a non-cancerous tumor that accounts for up to 90% of all cerebellopontine angle (CPA) tumors. The treatment for acoustic neuroma typically involves surgical removal of the tumor. The most common surgical approach is translabyrinthine surgery, which involves resection of the tumor in the inner auditory canal (IAC) and in the cerebellopontine horn area. Adequate excision of the IAC is essential for complete tumor removal from this area. However, this type of surgery can result in injuries to the inner ear, leading to hearing loss and balance problems. Advances in surgical techniques for IAC resection have improved canal exposure without causing significant damage to the inner ear. Objective: Preoperative imaging, such as three-dimensional (3D) high-resolution computed Tomography (HRCT), can be used to calculate the optimal resection angles for IAC excision. These images provide detailed information on the location and size of the tumor, as well as the surrounding structures in the ear. Methods: This study included 256 patients diagnosed with unilateral acoustic neuroma who underwent HRCT scans before and after surgery. Images were acquired and analyzed using the Syngo 2008G workstation. IAC was then assessed and surgery was planned based on the acquired HRCT images. Results: The optimal angle of grinding for the labyrinth was 42.3°, which allowed for IAC resection in 76.3% patients and total tumor resection in 94.1% patients as well as ensured the integrity of the labyrinth during the surgical procedure. Conclusion: We hope that our method of calculation will serve as a useful guide for practicing surgeons when performing this complex surgery. We anticipate that with the application of endoscope-assisted neurosurgical technique and electrophysiological monitoring, the preservation of facial and vestibulocochlear nerve functions in acoustic neuroma surgery will be further improved.

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Psychophysiological Response to Disorientation Training in Different Aircraft Pilots

Bustamante-Sánchez

Clemente‐Suárez

2020

Appl Psychophysiol Biofeedback

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Disorientation is one of the most important hazards in flights, but there is a need for a deeper analysis of its effect on the psychophysiological response of pilots. This study aimed to analyse the effect of disorientation training in cortical arousal, autonomic modulation, muscle strength, and perception. We analysed 39 male pilots of the Spanish Army and Air Force (27 Helicopter Pilots, 7 Transport Pilots and 5 F-18 Fighter Pilots) before and after disorientation training. Disorientation training produced an increase in perceived stress and effort in Helicopter Pilots (HP) and Transport Pilots (TP), and lower Heart Rate Variability (RMSSD) in all pilots. Rating of Perceived Exertion (RPE) and Handgrip Strength were more negatively affected among HP than in TP. RPE was more negatively affected in HP than among Fighter Pilots (FP). Forced Vital Capacity (FVC) and Forced Expiratory Volume in 1 s (FEV1) were significantly higher in FP (FVC 5.44 ± .407 l, FEV1 4.57 ± .407 l) than in HP (FVC 4.73 ± .547 l, FEV1 3.79 ± .712 l). Disorientation training affects the psychophysiological response of pilots, and different responses are depending on each job profile. These results could help to improve specific training for better preparation of pilots that face disorientation threats.

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Semicircular Canal Size and Shape Influence on Disorientation

Cited by 6 publications

References 0 publications

Quantitative assessment of inner ear variation in elasmobranchs

Quantitative assessment of inner ear variation in elasmobranchs

A hearing preservation technique for acoustic neuroma resection via retrosigmoid sinus approach

Psychophysiological Response to Disorientation Training in Different Aircraft Pilots

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