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https://www.readbyqxmd.com/read/28202575/models-of-utricular-bouton-afferents-role-of-afferent-hair-cell-connectivity-in-determining-spike-train-regularity
#1
William R Holmes, Janice A Huwe, Barbara Williams, Michael H Rowe, Ellengene H Peterson
Vestibular bouton afferent terminals in turtle utricle can be categorized into four types depending on their location and terminal arbor structure: lateral extrastriolar (LES), striolar, juxtastriolar, and medial extrastriolar (MES). The terminal arbors of these afferents differ in surface area, total length, collecting area, number of boutons, number of bouton contacts per hair cell and axon diameter (Huwe et al. 2015). To understand how differences in terminal morphology and the resulting hair cell inputs might affect afferent response properties, we modeled representative afferents from each region, using reconstructed bouton afferents (Huwe et al...
February 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28119230/change-in-the-natural-head-neck-orientation-momentarily-altered-sensorimotor-control-during-sensory-transition
#2
Isabelle Xu, Simon Laurendeau, Normand Teasdale, Martin Simoneau
Achilles tendon vibration generates proprioceptive information that is incongruent with the actual body position; it alters the perception of body orientation leading to a vibration-induced postural response. When a person is standing freely, vibration of the Achilles tendon shifts the internal representation of the verticality backward thus the vibration-induced postural response realigned the whole body orientation with the shifted subjective vertical. Because utricular otoliths information participates in the creation of the internal representation of the verticality, changing the natural orientation of the head-neck system during Achilles tendon vibration could alter the internal representation of the earth vertical to a greater extent...
January 17, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28104018/-the-ultrastructure-of-utricular-maculae-of-mouse
#3
L J Yang, L J Li, T Liu, L W Wang, P Shen
Objective: Using scanning electron microscope to observe the ultrastructure of utricular maculae of mouse. Methods: Ten young (6 to 8 weeks) and ten old (>12 months) mice were executed, and their utricles were harvested and the specimens were processed, using scanning electron microscope to observe the structures of the utricles from the surface of otoconia layer to the roots of hair cell cilia. Results: Under the scanning electron microscope, several ultrastructures were observed, including otoconia layer, unstructured gelatinous extracellular matrix layer, honeycomb-like gelatinous extracellular matrix layer, inter-cilia otoconia and hair cell cilia associated with these structures...
January 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28050646/gentamicin-applied-to-the-oval-window-suppresses-vestibular-function-in-guinea-pigs
#4
E B King, R K Shepherd, D J Brown, J B Fallon
Intratympanic gentamicin therapy is widely used clinically to treat the debilitating symptoms of Ménière's disease. Cochleotoxicity is an undesirable potential side effect of the treatment and the risk of hearing loss increases proportionately with gentamicin concentration in the cochlea. It has recently been shown that gentamicin is readily absorbed through the oval window in guinea pigs. The present study uses quantitative functional measures of vestibular and cochlea function to investigate the efficacy of treating the vestibule by applying a small volume of gentamicin onto the stapes footplate in guinea pigs...
January 3, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/27942898/assessment-of-endolymphatic-hydrops-and-otolith-function-in-patients-with-m%C3%A3-ni%C3%A3-re-s-disease
#5
Tomoko Okumura, Takao Imai, Yasumitsu Takimoto, Noriaki Takeda, Tadashi Kitahara, Atsuhiko Uno, Takefumi Kamakura, Yasuhiro Osaki, Yoshiyuki Watanabe, Hidenori Inohara
Ménière's disease is associated with hydrops of the inner ear endolymphatic space, and histopathologically, the cochlea and vestibule are usually involved. We used gadolinium-enhanced magnetic resonance imaging and measured cervical and ocular vestibular evoked myogenic potentials and the gain in the utricular induced linear vestibulo-ocular reflex to test the hypothesis that vestibular hydrops in Ménière's disease patients is associated with otolith organ dysfunction. We evaluated 21 patients diagnosed with unilateral definitive Ménière's disease using gadolinium magnetic resonance imaging to detect endolymphatic hydrops in the cochlea and vestibule...
December 10, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27942374/new-treatment-strategy-for-apogeotropic-horizontal-canal-benign-paroxysmal-positional-vertigo
#6
Francisco Zuma e Maia
The apogeotropic variant of horizontal semicircular canal benign paroxysmal positional vertigo (HC-BPPV) is attributed to canalithiasis of the anterior arm or cupulolithiasis. Despite some therapeutic maneuvers, I propose a new treatment strategy for apogeotropic HC-BPPV that is designed to detach both the otoconial debris from the anterior arm of the semicircular canal and the debris that is attached to the utricular side of the cupula using inertia and gravity and based on simulations with a 3D biomechanical model...
23, 2016: Audiology Research
https://www.readbyqxmd.com/read/27781157/the-cranial-endocast-of-dipnorhynchus-sussmilchi-sarcopterygii-dipnoi-and-the-interrelationships-of-stem-group-lungfishes
#7
Alice M Clement, Tom J Challands, John A Long, Per E Ahlberg
The first virtual cranial endocast of a lungfish from the Early Devonian, Dipnorhynchus sussmilchi, is described. Dipnorhynchus, only the fourth Devonian lungfish for which a near complete cranial endocast is known, is a key taxon for clarifying primitive character states within the group. A ventrally-expanded telencephalic cavity is present in the endocast of Dipnorhynchus demonstrating that this is the primitive state for "true" Dipnoi. Dipnorhynchus also possesses a utricular recess differentiated from the sacculolagenar pouch like that seen in stratigraphically younger lungfish (Dipterus, Chirodipterus, Rhinodipterus), but absent from the dipnomorph Youngolepis...
2016: PeerJ
https://www.readbyqxmd.com/read/27746123/subjective-visual-vertical-after-treatment-of-benign-paroxysmal-positional-vertigo
#8
Maristela Mian Ferreira, Maurício Malavasi Ganança, Heloisa Helena Caovilla
INTRODUCTION: Otolith function can be studied by testing the subjective visual vertical, because the tilt of the vertical line beyond the normal range is a sign of vestibular dysfunction. Benign paroxysmal positional vertigo is a disorder of one or more labyrinthine semicircular canals caused by fractions of otoliths derived from the utricular macula. OBJECTIVE: To compare the subjective visual vertical with the bucket test before and immediately after the particle repositioning maneuver in patients with benign paroxysmal positional vertigo...
September 28, 2016: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/27726156/otoconia-and-otolithic-membrane-fragments-within-the-posterior-semicircular-canal-in-benign-paroxysmal-positional-vertigo
#9
Wee Tin K Kao, Lorne S Parnes, Richard A Chole
OBJECTIVES/HYPOTHESIS: Benign paroxysmal positional vertigo (BPPV) is the most common vestibular disorder with an incidence between 10.7 and 17.3 per 100,000 persons per year. The mechanism for BPPV has been postulated to involve displaced otoconia resulting in canalithiasis. Although particulate matter has been observed in the endolymph of affected patients undergoing posterior canal occlusion surgery, an otoconial origin for the disease is still questioned. STUDY DESIGN: In this study, particulate matter was extracted from the posterior semicircular canal of two patients and examined with scanning electron microscopy...
March 2017: Laryngoscope
https://www.readbyqxmd.com/read/27718352/utility-of-the-frequency-tuning-measure-of-ovemp-in-differentiating-meniere-s-disease-from-bppv
#10
Niraj Kumar Singh, Animesh Barman
BACKGROUND: Utility of frequency tuning of ocular vestibular evoked myogenic potential (oVEMP) for evaluation of utricular function in individuals with Meniere's disease is a recent development. However, there is dearth of studies regarding its utility in differential diagnosis of Meniere's disease from other vestibular pathologies. PURPOSE: The present study aimed at investigating the feasibility of frequency tuning of oVEMP in discriminating Meniere's disease from benign paroxysmal positional vertigo (BPPV)...
October 2016: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/27703443/a-cross-sectional-survey-and-cross-sectional-clinical-trial-to-determine-the-prevalence-and-management-of-eye-movement-disorders-and-vestibular-dysfunction-in-post-stroke-patients-in-the-sub-acute-phase-protocol
#11
Andoret van Wyk, Carina A Eksteen, Piet J Becker, Barbara M Heinze
INTRODUCTION: Visual impairment, specifically eye movement disorders and vestibular dysfunction may have a negative influence on the functional recovery in post-stroke patients. This type of sensory dysfunction may further be associated with poor functional outcome in patients' post-stroke. METHODS: In phase 1, a cross-sectional survey (n = 100) will be conducted to determine the prevalence of eye movement disorders and vestibular dysfunction in patients who sustained a stroke...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27694256/vestibular-neuritis-affects-both-superior-and-inferior-vestibular-nerves
#12
Rachael L Taylor, Leigh A McGarvie, Nicole Reid, Allison S Young, G Michael Halmagyi, Miriam S Welgampola
OBJECTIVE: To characterize the profiles of afferent dysfunction in a cross section of patients with acute vestibular neuritis using tests of otolith and semicircular canal function sensitive to each of the 5 vestibular end organs. METHODS: Forty-three patients fulfilling clinical criteria for acute vestibular neuritis were recruited between 2010 and 2016 and studied within 10 days of symptom onset. Otolith function was evaluated with air-conducted cervical and bone-conducted ocular/vestibular evoked myogenic potentials and the subjective visual horizontal test...
October 18, 2016: Neurology
https://www.readbyqxmd.com/read/27522490/spatial-orientation-in-patients-with-chronic-unilateral-vestibular-hypofunction-is-ipsilesionally-distorted
#13
Julia A Müller, Christopher J Bockisch, Alexander A Tarnutzer
OBJECTIVE: Acute unilateral peripheral-vestibular hypofunction (UVH) shifts the subjective visual vertical (SVV) ipsilesionally, triggering central compensation that usually eliminates shifts when upright. We hypothesized that compensation is worse when roll-tilted. METHODS: We quantified SVV errors and variability in different roll-tilted positions (0°, ±45°, ±90°) in patients with chronic UVH affecting the superior branch (SVN; n=4) or the entire (CVN; n=9) vestibular nerve...
October 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27466890/vestibular-impairment-in-dementia
#14
Aisha Harun, Esther S Oh, Robin T Bigelow, Stephanie Studenski, Yuri Agrawal
OBJECTIVE: Recent studies suggest an association between vestibular and cognitive function. The goal of the study was to investigate whether vestibular function was impaired in individuals with mild cognitive impairment (MCI) and Alzheimer's disease (AD) compared with cognitively normal individuals. STUDY DESIGN: Cross-sectional study. SETTING: Outpatient memory clinic and longitudinal observational study unit. PATIENTS: Older individuals ≥55 years with MCI or AD...
September 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27435969/vertigo-with-sudden-hearing-loss-audio-vestibular-characteristics
#15
Jacob M Pogson, Rachael L Taylor, Allison S Young, Leigh A McGarvie, Sean Flanagan, G Michael Halmagyi, Miriam S Welgampola
Acute vertigo with sudden sensorineural hearing loss (SSNHL) is a rare clinical emergency. Here, we report the audio-vestibular test profiles of 27 subjects who presented with these symptoms. The vestibular test battery consisted of a three-dimensional video head impulse test (vHIT) of semicircular canal function and recording ocular and cervical vestibular-evoked myogenic potentials (oVEMP, cVEMP) to test otolith dysfunction. Unlike vestibular neuritis, where the horizontal and anterior canals with utricular function are more frequently impaired, 74 % of subjects with vertigo and SSNHL demonstrated impairment of the posterior canal gain (0...
October 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27339083/comparison-of-laparoscopic-excision-versus-open-transvesical-excision-for-symptomatic-prostatic-utricle-in-children
#16
COMPARATIVE STUDY
Wei Jia, Guo-Chang Liu, Li-Yu Zhang, Ying-Quan Wen, Wen Fu, Jin-Hua Hu, Hui-Min Xia
PURPOSE: The aims of this study were to report our clinical experience with laparoscopic excision (LE) and to compare the outcomes of LE versus open transvesical excision (OTE) for the management of prostatic utricle (PU) in children. PATIENTS AND METHODS: This was a retrospective single-center study of 14 children who underwent OTE or LE for managing symptomatic PU between April 2003 and December 2014. Age, utricle size, operative time, estimated blood loss, duration of hospital stay, indwelling time of the urethral catheter, presence of residual postoperative utricular stump, and complications were compared between the two groups...
October 2016: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/27329136/evaluation-of-the-otolith-function-using-c-ovemps-in-patients-with-m%C3%A3-ni%C3%A3-re-s-disease
#17
Liang Chen, Hui Xu, Wu-Qing Wang, Qing-Quan Zhang, Qiao-Ying Lv, Xi-Cheng Song
BACKGROUND: Cervical and ocular vestibular evoked myogenic potentials (c/oVEMPs) reflect otolith function. Up-to-date, there are no published reports on the systemic evaluation of otolith function in Ménière's Disease (MD) nor are there any reports on the differences in VEMPs between patients with early and late stage MD. The aim of this study was to evaluate the difference in c/oVEMPs between patients with MD and normal controls, as well as between patients with early and late stage MD...
June 21, 2016: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/27165682/racial-differences-of-pigmentation-in-the-human-vestibular-organs
#18
Isaac D Erbele, Frank R Lin, Yuri Agrawal, Howard W Francis, John P Carey, Wade W Chien
OBJECTIVES: Melanin pigmentation is present in the human inner ear. In this study, we quantify the melanin pigmentation in the vestibular system and examine racial differences of vestibular melanin pigmentation using human cadaveric temporal bone specimens. STUDY DESIGN: Basic research. SETTING: Laboratory. SUBJECTS AND METHODS: Light microscopy was used to examine specimens from 40 left temporal bones from the Johns Hopkins Human Temporal Bone Collection...
September 2016: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/27145032/dopamine-modulates-motor-control-in-a-specific-plane-related-to-support
#19
Marc Herbin, Caroline Simonis, Lionel Revéret, Rémi Hackert, Paul-Antoine Libourel, Daniel Eugène, Jorge Diaz, Catherine de Waele, Pierre-Paul Vidal
At the acute stage following unilateral labyrinthectomy (UL), rats, mice or guinea pigs exhibit a complex motor syndrome combining circling (HSCC lesion) and rolling (utricular lesion). At the chronic stage, they only display circling, because proprioceptive information related to the plane of support substitutes the missing utricular information to control posture in the frontal plane. Circling is also observed following unilateral lesion of the mesencephalic dopaminergic neurons by 6- hydroxydopamine hydrobromide (6-OHDA rats) and systemic injection of apomorphine (APO rats)...
2016: PloS One
https://www.readbyqxmd.com/read/27083418/temporal-coupling-between-specifications-of-neuronal-and-macular-fates-of-the-inner-ear
#20
Xiaohong Deng, Doris K Wu
The inner ear is a complex organ comprised of various specialized sensory organs for detecting sound and head movements. The timing of specification for these sensory organs, however, is not clear. Previous fate mapping results of the inner ear indicate that vestibular and auditory ganglia and two of the vestibular sensory organs, the utricular macula (UM) and saccular macula (SM), are lineage related. Based on the medial-lateral relationship where respective auditory and vestibular neuroblasts exit from the otic epithelium and the subsequent formation of the medial SM and lateral UM in these regions, we hypothesized that specification of the two lateral structures, the vestibular ganglion and the UM are coupled and likewise for the two medial structures, the auditory ganglion and the SM...
June 1, 2016: Developmental Biology
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