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https://www.readbyqxmd.com/read/29142237/inner-ear-otolith-asymmetry-in-late-larval-cichlid-fish-oreochromis-mossambicus-perciformes-showing-kinetotic-behaviour-under-diminished-gravity
#1
Ralf Anken, Miriam Knie, Reinhard Hilbig
The inner ears of all vertebrates are designed to perceive auditory and vestibular inputs. Although a tremendous diversity in the inner ear can be found even among bony fishes, the morphologies of the utricle and of the semicircular canals are rather conservative among vertebrates. Fish show kinetoses under reduced gravity (spinning movements and looping responses) and are regarded model organisms concerning the performance of the otolithic organs. Otoliths can be analysed easily because they are compact, in contrast to the otoconial masses of other vertebrates...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29134056/semicircular-canals-in-anolis-lizards-ecomorphological-convergence-and-ecomorph-affinities-of-fossil-species
#2
Blake V Dickson, Emma Sherratt, Jonathan B Losos, Stephanie E Pierce
Anolis lizards are a model system for the study of adaptive radiation and convergent evolution. Greater Antillean anoles have repeatedly evolved six similar forms or ecomorphs: crown-giant, grass-bush, twig, trunk, trunk-crown and trunk-ground. Members of each ecomorph category possess a specific set of morphological, ecological and behavioural characteristics which have been acquired convergently. Here we test whether the semicircular canal system-the organ of balance during movement-is also convergent among ecomorphs, reflecting the shared sensory requirements of their ecological niches...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29116385/hearing-eyeball-and-or-eyelid-movements-on-the-side-of-a-unilateral-superior-semicircular-canal-dehiscence
#3
Pierre Bertholon, Pierre Reynard, Yann Lelonge, Roland Peyron, François Vassal, Alexandre Karkas
Hearing of eyeball movements has been reported in superior semicircular canal dehiscence (SSCD), but not hearing of eyelid movements. Our main objective was to report the hearing of eyeball and/or eyelid movements in unilateral SSCD. Our secondary objective was to access its specificity to SSCD and discuss the underlying mechanism. Six patients with SSCD who could hear their eyeball and/or eyelid movements were retrospectively reviewed. With the aim of comparisons, eight patients with an enlarged vestibular aqueduct (EVA), who share the same mechanism of an abnormal third window, were questioned on their ability to hear their eyeball and/or eyelid movements...
November 8, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29094067/comorbidities-confounding-the-outcomes-of-surgery-for-third-window-syndrome-outlier-analysis
#4
P Ashley Wackym, Heather T Mackay-Promitas, Shaban Demirel, Gerard J Gianoli, Martin S Gizzi, Dale M Carter, David A Siker
Objective: Patients with third window syndrome and superior semicircular canal dehiscence (SSCD) symptoms whose surgical outcomes placed them as outliers were systematically studied to determine comorbidities that were responsible for their poor outcomes due to these confounding factors. Study Design: Observational analytic case-control study in a tertiary referral center. Methods: Twelve adult patients with clinical SSCD syndrome underwent surgical management and had outcomes that did not resolve all of their subjective symptoms...
October 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/29093698/the-role-of-predictability-in-saccadic-eye-responses-in-the-suppression-head-impulse-test-of-horizontal-semicircular-canal-function
#5
Jorge Rey-Martinez, Joaquin Yanes, Jonathan Esteban, Ricardo Sanz, Eduardo Martin-Sanz
Background: In the suppression head impulse paradigm (SHIMP) vHIT protocol, the participant is instructed to follow with his gaze a mobile target generated by a laser placed on the participant's head. Recent studies have reported that the refixation saccade latencies are in relation with the time evolution of the vestibular dysfunction in both (standard and SHIMP) procedures. We hypothesized that some central mechanisms like head impulse prediction could be one of the causes for the differences in the saccadic eye responses...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29082607/inner-ear-manifestations-in-charge-abnormalities-treatments-animal-models-and-progress-toward-treatments-in-auditory-and-vestibular-structures
#6
REVIEW
Daniel I Choo, Kareem O Tawfik, Donna M Martin, Yehoash Raphael
The inner ear contains the sensory organs for hearing and balance. Both hearing and balance are commonly affected in individuals with CHARGE syndrome (CS), an autosomal dominant condition caused by heterozygous pathogenic variants in the CHD7 gene. Semicircular canal dysplasia or aplasia is the single most prevalent feature in individuals with CHARGE leading to deficient gross motor skills and ambulation. Identification of CHD7 as the major gene affected in CHARGE has enabled acceleration of research in this field...
October 30, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29079887/preoperative-determination-of-nerve-of-origin-in-patients-with%C3%A2-vestibular%C3%A2-schwannoma
#7
T Rahne, S Plößl, S K Plontke, C Strauss
BACKGROUND: Vestibular schwannoma (VS) is a benign tumor that develops in the internal auditory canal and the cerebellopontine angle, potentially diminishing hearing or balance. Most VS tumors arise from one of two vestibular branches: the superior or inferior vestibular nerve. Determining the specific nerve of origin could improve patient management in terms of preoperative counseling, treatment selection, and surgical decision-making and planning. The aim of this study was to introduce a novel scoring system that was designed to determine the nerve of origin...
October 27, 2017: HNO
https://www.readbyqxmd.com/read/29067619/transparent-model-of-temporal-bone-and-vestibulocochlear-organ-made-by-3d-printing
#8
Ryoji Suzuki, Naoto Taniguchi, Fujio Uchida, Akimitsu Ishizawa, Yoshinori Kanatsu, Ming Zhou, Kodai Funakoshi, Hideo Akashi, Hiroshi Abe
The vestibulocochlear organ is composed of tiny complex structures embedded in the petrous part of the temporal bone. Landmarks on the temporal bone surface provide the only orientation guide for dissection, but these need to be removed during the course of dissection, making it difficult to grasp the underlying three-dimensional structures, especially for beginners during gross anatomy classes. We report herein an attempt to produce a transparent three-dimensional-printed model of the human ear. En bloc samples of the temporal bone from donated cadavers were subjected to computed tomography (CT) scanning, and on the basis of the data, the surface temporal bone was reconstructed with transparent resin and the vestibulocochlear organ with white resin to create a 1:1...
October 24, 2017: Anatomical Science International
https://www.readbyqxmd.com/read/29065090/do-measurements-of-inner-ear-structures-help-in-the-diagnosis-of-inner-ear-malformations-a-review-of-literature
#9
Felice D'Arco, Giacomo Talenti, Rahul Lakshmanan, Kate Stephenson, Ata Siddiqui, Olivia Carney
OBJECTIVE: We conducted an extensive review of the literature relevant to inner ear measurements in normal and malformative conditions to select reproducible methods and normative ranges that may be used in clinical practice. DATA SOURCES AND STUDY SELECTION: A review of the published literature was performed in the English language using PubMed with appropriate keywords. We selected only those articles containing normative values of inner ear structures. DATA EXTRACTION AND DATA SYNTHESIS: The following measurements were identified as reproducible and sensitive for the diagnosis of inner malformations: cochlear height in coronal plane; maximal diameter of bony island of lateral semicircular canal; width of vestibular aqueduct: 1) at midpoint; 2) at operculum in axial plane; cochlear canal and cochlear width in multiplanar reconstructions (MPR)/axial; cochlear length...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29061034/the-light-cupula-an-emerging-new-concept-for-positional-vertigo
#10
Min-Beom Kim, Seok Min Hong, Hyerang Choi, Seongjun Choi, Ngoc Chien Pham, Jung Eun Shin, Chang-Hee Kim
Benign paroxysmal positional vertigo (BPPV) is the most common type of positional vertigo. A canalolithiasis-type of BPPV involving the lateral semicircular canal (LSCC) shows a characteristic direction-changing positional nystagmus (DCPN) which beats towards the lower ear (geotropic) on turning the head to either side in a supine position. Because geotropic DCPN in LSCC canalolithiasis is transient with a latency of a few seconds, the diagnosis can be challenging if geotropic DCPN is persistent without latency...
October 24, 2017: Journal of Audiology & Otology
https://www.readbyqxmd.com/read/29056463/a-high-jugular-bulb-and-poor-development-of-perivestibular-aqueductal-air-cells-are-not-the-cause-of-endolymphatic-hydrops-in-patients-with-m%C3%A3-ni%C3%A3-re-s-disease
#11
Ryohei Oya, Takao Imai, Takashi Sato, Atsuhiko Uno, Yoshiyuki Watanabe, Suzuyo Okazaki, Yumi Ohta, Tadashi Kitahara, Arata Horii, Hidenori Inohara
OBJECTIVE: The presence of endolymphatic hydrops in the inner ear, which can be detected with gadolinium-enhanced magnetic resonance imaging (Gd-MRI), is widely recognized as the main pathological cause of Ménière's disease (MD). However, the precise mechanisms underlying the development of endolymphatic hydrops remains unclear. One hypothesis proposes a relationship between the presence of a high jugular bulb (HJB) and MD, which disrupts the vestibular aqueduct leading to the development of endolymphatic hydrops...
October 19, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29042574/size-variation-under-domestication-conservatism-in-the-inner-ear-shape-of-wolves-dogs-and-dingoes
#12
Anita V Schweizer, Renaud Lebrun, Laura A B Wilson, Loïc Costeur, Thomas Schmelzle, Marcelo R Sánchez-Villagra
A broad sample of wolves, dingoes, and domesticated dogs of different kinds and time periods was used to identify changes in size and shape of the organs of balance and hearing related to domestication and to evaluate the potential utility of uncovered patterns as markers of domestication. Using geometric morphometrics coupled with non-invasive imaging and three-dimensional reconstructions, we exposed and compared complex structures that remain largely conserved. There is no statistically significant difference in the levels of shape variation between prehistoric and modern dogs...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29022108/middle-cranial-fossa-approach-for-the-repair-of-superior-semicircular-canal-dehiscence-is-associated-with-greater-symptom-resolution-compared-to-transmastoid-approach
#13
REVIEW
Thien Nguyen, Carlito Lagman, John P Sheppard, Prasanth Romiyo, Courtney Duong, Giyarpuram N Prashant, Quinton Gopen, Isaac Yang
BACKGROUND: Superior semicircular canal dehiscence (SSCD) is a disorder of the skull base that is gaining increasing recognition among neurosurgeons. Traditionally, the middle cranial fossa (MCF) approach has been used for the surgical repair of SSCD. However, the transmastoid (TM) approach is an alternative strategy that has demonstrated promising results. METHODS: We performed independent searches of a popular database to identify studies that described outcomes following the surgical repair of SSCD through MCF and TM approaches...
October 11, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29021317/sensory-anatomy-of-the-most-aquatic-of-carnivorans-the-antarctic-ross-seal-and-convergences-with-other-mammals
#14
Cleopatra Mara Loza, Ashley E Latimer, Marcelo R Sánchez-Villagra, Alfredo A Carlini
Transitions to and from aquatic life involve transformations in sensory systems. The Ross seal, Ommatophoca rossii, offers the chance to investigate the cranio-sensory anatomy in the most aquatic of all seals. The use of non-invasive computed tomography on specimens of this rare animal reveals, relative to other species of phocids, a reduction in the diameters of the semicircular canals and the parafloccular volume. These features are independent of size effects. These transformations parallel those recorded in cetaceans, but these do not extend to other morphological features such as the reduction in eye muscles and the length of the neck, emphasizing the independence of some traits in convergent evolution to aquatic life...
October 2017: Biology Letters
https://www.readbyqxmd.com/read/29018402/preferential-impairment-of-the-contralesional-posterior-semicircular-canal-in-internuclear-ophthalmoplegia
#15
Seung-Han Lee, Sang-Hoon Kim, Sung-Sik Kim, Kyung Wook Kang, Alexander Andrea Tarnutzer
BACKGROUND: The vertical vestibulo-ocular reflex (VOR) may be impaired in internuclear ophthalmoplegia (INO) as the medial longitudinal fasciculus (MLF) conveys VOR-signals from the vertical semicircular canals. It has been proposed that signals from the contralesional posterior semicircular canal (PSC) are exclusively transmitted through the MLF, while for the contralesional anterior canal other pathways exist. OBJECTIVE: Here, we aimed to characterize dysfunction in individual canals in INO-patients using the video-head-impulse test (vHIT) and to test the hypothesis of dissociated vertical canal impairment in INO...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28990655/round-window-plugging-in-the-treatment-of-superior-semicircular-canal-dehiscence
#16
Eric F Succar, Periakaruppan V Manickam, Sara Wing, Jeffrey Walter, Joseph S Greene, William J Azeredo
OBJECTIVES/HYPOTHESIS: Objectives were to describe the use of round window plugging for superior semicircular canal dehiscence syndrome and review further recommendations regarding the procedure based on our experience and to compare results with recent literature on round window plugging. STUDY DESIGN: Retrospective case series. METHODS: Fourteen patients underwent round window plugging for superior semicircular canal dehiscence at our institution from 2012 to 2015...
October 9, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28981340/vestibular-consequences-of-mild-traumatic-brain-injury-and-blast-exposure-a-review
#17
Faith W Akin, Owen D Murnane, Courtney D Hall, Kristal M Riska
The purpose of this article is to review relevant literature on the effect of mild traumatic brain injury (mTBI) and blast injury on the vestibular system. Dizziness and imbalance are common sequelae associated with mTBI, and in some individuals, these symptoms may last for six months or longer. In war-related injuries, mTBI is often associated with blast exposure. The causes of dizziness or imbalance following mTBI and blast injuries have been linked to white matter abnormalities, diffuse axonal injury in the brain, and central and peripheral vestibular system damage...
2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28980781/-inferior-vestibular-neuritis
#18
Stephen Jacques Alzuphar, Raphaël Maire
Inferior vestibular neuritis is a rare form of acute peripheral vestibular loss that only implies the lesion of the inferior vestibular nerve. The diagnosis is based on the observation of a spontaneous downbeating nystagmus, pathological head impulse test for the posterior semicircular canal and abnormal cervical vestibular-evoked myogenic potentials. Bithermal caloric testing and head impulse test for horizontal and anterior canals are normal, as well as the ocular vestibular-evoked myogenic potentials. The differential diagnosis of inferior vestibular neuritis includes the various central lesions that produce vertical down beating nystagmus (posterior fossa) and a cerebral magnetic resonance imaging is mandatory...
October 4, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28980586/-the-importance-of-vestibular-evoked-myogenic-potentials-for-the-assessment-of-the-otolith-function-in-the-patients-presenting-with-benign-paroxysmal-positional-vertigo
#19
N L Kunel'skaya, E V Baybakova, A L Guseva, M A Chugunova, E A Manaenkova
The objective of the present study was to evaluate the otolith function in the patients presenting with idiopathic benign paroxysmal positional vertigo (pBPPV) attributable to the occlusion of the posterior semicircular canal (PSCC) of the inner ear with the use of vestibular evoked myogenic potentials (VEMP). Cervical (cVEMP) and ocular VEMP (oVEMP) were measured in 34 patients with idiopathic pBPPV before and 7 days after the treatment by means of reposition maneuvers. The results of the repeated Dix-Hallpike test performed 7 days after the repositioning maneuver were negative in 27 patients and positive in 7 patients...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28978765/convergence-of-linear-acceleration-and-yaw-rotation-signals-on-non-eye-movement-neurons-in-the-vestibular-nucleus-of-macaques
#20
Shawn D Newlands, Ben Abbatematteo, Min Wei, Laurel H Carney, Hongge Luan
Roughly half of all vestibular nucleus neurons without eye movement sensitivity respond to both angular rotation and linear acceleration. Linear acceleration signals arise from otolith organs and rotation signals arise from semicircular canals. In the vestibular nerve, these signals are carried by different afferents. Vestibular nucleus neurons represent the first point of convergence for these distinct sensory signals. This study systematically evaluated how rotational and translational signals interact in single neurons in the vestibular nuclei: multisensory integration at the first opportunity for convergence between these two independent vestibular sensory signals...
October 4, 2017: Journal of Neurophysiology
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