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Topic: Vestibular system


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In the News (Tue 20 Aug 19)

  
  Vestibular System
Because the vestibular labyrinth and the auditory structure are formed very early in the development of the fetus and the fluid pressure contained within both of them is mutually dependant, a disorder in one of the two reciprocating structures affects the (2).
Because the vestibular system of the toadfish is similar to humans, it has been used in the bulk of studies on the vestibular system (5).
The alteration of the vestibular system is especially acute for astronauts.
serendip.brynmawr.edu /bb/neuro/neuro99/web3/Brock.html   (1035 words)

  
 Motor Systems
The pyramidal system is a two neuron system consisting of upper motor neurons in the Primary Motor Cortex and lower motor neurons in the anterior horn of the spinal cord.
The main sensory organ of the vestibular system is located in the inner ear and consists of the Utricle, the Sacculus and the Semicircular canals.
The major cerebellar tracts are the Spinocerebellar, connecting the spinal cord and the cerebellum, the Vestibulospinal, connecting the vestibular system and the cerebellum, Corticopontocerebellar, connecting the cortex, pons and cerebellum and the Dentatorubrothalamic connecting the dentate nucleus of the cerebellum, the red nucleus and the thalamus.
pathology.mc.duke.edu /neuropath/nawr/motor-systems.html   (1173 words)

  
 Vestibular Disease
The vestibular system senses the position of the head and body in space, in relation to gravity and movement.
The receptors for the vestibular system are located in the inner ear, adjacent to the hearing receptors.
Vestibular information is processed in the lower portion of the brain in the brainstem and cerebellum.
www.canine-epilepsy.com /vestibular.html   (537 words)

  
 Vestibular system Summary
The membrane demarcating the vestibular canal and the cochlea duct is Reissner's membrane.
The membrane demarcating the tympanic canal and the cochlear duct is the basilar membrane.
In addition, the function of the vestibular system can be affected by tumors on the cochleo-vestibular nerve, an infarct in the brain stem or in cortical regions related to the processing of vestibular signals, and cerebellar atrophy.
www.bookrags.com /Vestibular_system   (1971 words)

  
 [No title]   (Site not responding. Last check: 2007-10-14)
Throughout evolution, the highly conserved nature of the vestibular system is re vealed through striking similarities in the anatomic or ganization of receptors and neuronal connections in fish, reptiles, birds, and mammals.
For the present discussion, the vestibular system can be divided into five components: (1) The peripheral receptor apparatus resides in the inner ear and is respon sible for transducing head motion and position into neural information.
The vestibular labyrinth consists of five separate receptor structures, three semicircular canals and two otolith organs, which are contained in the petrous portion of the temporal bone.
vestibular.wustl.edu /vestibular.html   (1478 words)

  
 Vertigo and Vestibular Function
The mismatch between what the vestibular system is signalling ("head moving") and what the eyes are signalling ("head not moving") generates the accompanying nausea and vomiting.
Vestibular nystagmus is always jerk in form, meaning it has a slow phase in one direction and a fast phase in the other.
If the vestibular system on the side to which you turn the head is defective, then the patient's eyes will not stay on target but will move with the head.
www.sightstreet.com /Content/OpthalmicLibrary/neu_vertigo_csro1020.htm   (3720 words)

  
 Medical Mgt of Vistibular Disorders & Vestibular Rehabilitation(Apr.1996)
There is evidence of convergance of the two systems in the nucleus of the solitary tract, the parabrachial nucleus, and the rostral ventrolateral medullary reticular formation.
Onset is often preceded by a viral infection of the respiratory or gastrointestinal systems and epidemics are not uncommon.
Systemic and intratympanic glucocorticoids, cyclophosphamide, and methotrexate have all been used by clinicians but this treatment is controversial at best currently.
www.utmb.edu /otoref/Grnds/Vestibular-0004/Vestibular-0004.htm   (4201 words)

  
 Veterinary Care Specialists Vestibular System Info   (Site not responding. Last check: 2007-10-14)
The vestibular system is the primary sensory system that maintains the animal's balance or its normal orientation relative to the gravitational field of the earth.
The vestibular system is responsible for maintaining the position of the eyes, trunk, and the limbs in reference to the position or movement of the head at any time.
The peripheral vestibular system along with it's central components, in particular the vestibulospinal tract, allow orientation of the limbs and body and coordination of movement to maintain an appropriate posture.
www.vcsmilford.com /vs.html   (2300 words)

  
 HyperBrain Syllabus Chapter 8
The primary sensory axons of the vestibular system comprise the vestibular nerve (#7448), a division of cranial nerve VIII.
The vestibular system can also be unnaturally stimulated, i.e., irritated, by inner ear infections, infections in the mastoid process (#5451) or by a tumor pressing on the vestibular nerve or nuclei (#15179).
The cortical area for the vestibular system is not well defined but is thought to be in the postcentral gyrus (#4208) near the representation for the face.
www-medlib.med.utah.edu /kw/hyperbrain/syllabus/syllabus8.html   (973 words)

  
 Canadian Pharmacy - Online Pharmacy Direct, Discount Canada Drugs from Canadian Pharmacies, Canada Rx Prescription ...
In this case, the continued motion of the head, as measured by the vestibular system, is not accompanied by a commensurate motion of the visual scene.
Thus, until the vestibular system is able to readapt itself, individuals often report the feeling of motion for several hours to days after disembarking from a sea voyage.
Since the vestibular system is very sensitive to a lack of oxygen, balance problems are often one of the first symptoms of vertebral basilar insufficiency.
www.onlinepharmacydirect.org /terms/vestibular_balance_disorders.html   (6459 words)

  
 Tilted Mice
The tlt/tlt mutants are a particularly attractive model for the study of vestibular function since unlike other mouse mutations affecting the vestibular system, the primary defect in the tilted mouse is limited to the most proximal part of the receptors of the vestibular system.
We wish to (a) assess immediate and delayed effects on the vestibular system with particular focus on characterization of primarily affected periods of vestibular morphogenesis, and (b) to identify downstream genetic pathways that are altered in the CNS of the tlt/tlt mutant mouse, which lacks gravity receptor input.
To characterize the postnatal morphogenesis of the vestibular system in the tlt/tlt mutant mouse, with particular focus on the vestibular ganglion and the vestibular nuclei in the brain stem.
www.ecu.edu /physio/labakm/tilted.htm   (990 words)

  
 American Institute of Balance - www.dizzy.com   (Site not responding. Last check: 2007-10-14)
Vestibular Rehabilitation has emerged over the past several years as an exciting and successful alternative treatment for patients with chronic non-resolved motion intolerance and imbalance problems.
In order to understand how Vestibular Rehabilitation works and the underlying corrective mechanisms, it is important to remember that the primary role of the vestibular system is to tell the brain where the head is. Quite simply, the vestibular system is our internal reference telling the brain how our head is orientated in space.
A primary component of the equilibrium system adversely effected by the imbalance from the two peripheral vestibular mechanisms is the vestibulo-ocular reflex.
www.dizzy.com /script/vestibularrehabilitation.asp   (1077 words)

  
 The Theoretical Components   (Site not responding. Last check: 2007-10-14)
Because the vestibular system combines the inertial information from the three semi-circular canals with the gravitational orientation provided by the otolith organ, it is the basis of our inertial gravitational model of the world—that is, our model of the world as three-dimensional space with a clear sense of up and down.
Because the vestibular system is the basis of this three-dimensional model of the world, the effectiveness of the various senses in communicating information accurately to the brain is limited by the precision of the vestibular system.
Since the visual system is integrated with the vestibular system or sense of balance, Balametrics has developed products and activities that stimulate balance while also integrating the visual system to improve binocular teaming and visual processing.
www.balametrics.com /explain.htm   (2578 words)

  
 Vestibular System and Vertigo - Maryland Hearing and Balance Center
When the vestibular system functions improperly, a person may feel like they are moving even when they are not.
Vestibular therapy with attention to physical therapy of the neck muscles is the indicated treatment.
System specific- VRT exercises can strengthen the vestibular system and its reflexes, thereby improving residual function in patients who have had an injury to the inner ears or central vestibular pathways.
www.umm.edu /otolaryngology/vertigo.html   (1384 words)

  
 Vestibular Adaptation and aftereffects measurement
This task is not straightforward, given that the term "vestibular adaptation" is not clearly and uniquely defined in the literature and that it implies adaptation of the vestibular organ itself.
For such non-motion-base VE systems any role of the vestibular system must come in the context of interactions between the vestibule and other perceptual systems that are directly stimulated by the VE.
Vestibular stimulation that is modeled in the absence of visual stimulation is referred to as Vest/no Vis, while Visual stimulation that is modeled in the absence of vestibular stimulation is referred to as Vis/no Vest.
vehand.engr.ucf.edu /handbook/Chapters/Chapter44/Chapter_44.html   (7411 words)

  
 The Children's Center for Neurodevelopmental Studies
It has been said that gravity is the essential fact of life on earth; therefore it is not strange that the vestibular system, which relates us to gravity, is very closely connected with the entire physiology of the body.
Most people have experienced motion sickness when the vestibular system is over-stimulated and signals the digestive system that there is a problem.
And, of course, the vestibular system is best known as it determines our ability to balance, to climb stairs, to walk easily, to adjust to changing levels, to react promptly, (recover our balance) when we step in a hole.
www.thechildrenscenteraz.org /vestibular.htm   (618 words)

  
 Vestibular Syndrome In Dogs And Cats - facts about canine and feline vestibular syndrome
Third, while head and body are in motion, the vestibular system controls eye movements so that images remain steady and in focus.
Like the neighboring auditory system, each canal has hair cells that detect minute changes in fluid displacement, but unlike the auditory system, the utricle and the saccule send information to the brain regarding linear acceleration and head tilt.
If the ear is found to be free of infection, then it must be assumed that the vestibular syndrome is ideopathic in origin, or there is cancer.  Since cancer of the vestibular system is quite rare, I only revisit that possibility if the patient does not resolve.
www.maybeckvet.com /vestibularsyndrome.html   (356 words)

  
 Notes on Vestibular Rehabilitation for the Clinician - Otolaryngology, The University of Kansas Medical Center
After a unilateral vestibular insult, there is persistent asymmetry in the vestibular nerve discharge rates leading to the incorrect sensation of vertigo and motion.
The mechanisms for the static and dynamic aspects of vestibular compensation to a peripheral deficit are largely unknown.
Purkyne's contributions to the physiology of the visual, the vestibular and the oculomotor systems.
www2.kumc.edu /otolaryngology/otology/VRforMDs.htm   (1527 words)

  
 [No title]   (Site not responding. Last check: 2007-10-14)
The sensory receptor cells in the vestibular system, like those in the auditory system, are called hair cells owing to the stereocilia that project from the apical surface of the cell (Fig.
The mechanisms underlying the depolarization and hyperpolarization of vestibular hair cells depend, respectively, on the potassium-rich character of endo lymph and the potassium-poor character of the perilymph that bathes the basal and lateral portions of the hair cells.
Morphologic polarization of vestibular receptor cells showing polarity of stereocilia and kinocilia (A), and the orientation of receptors in the ampullae (B) and maculae (C).
vestibular.wustl.edu /vestibular2.html   (1216 words)

  
 cog_shop_second_level_page   (Site not responding. Last check: 2007-10-14)
The human vestibular system plays a critical role in thecoordination of motor responses, eye movement, posture, and balance.
The human vestibular sensory organ consists of the three semi-circular canals, which measure the acceleration of head rotation, and the two otolith organs, which measure linear movements of the head and the orientation of the head relativeto gravity.
To mimic the human vestibular system, Cog has three rate gyroscopesmounted on orthogonal axes (corresponding to the semi-circular canals) and twolinear accelerometers (corresponding to the otolith organs).
www.ai.mit.edu /projects/cog/VestibularSystem/vestibular_system.html   (126 words)

  
 Web of Life - NASA's Fundamental Space Biology Outreach Program
The vestibular system (Figure 2), which is key to our senses of balance, motion, and body position, is comprised of three semicircular canals connected to two membranous sacs called the saccule and utricle.
The vestibular system also helps you maintain a fixed gaze on a stationary or moving external object while you are undergoing complex head and body movements.
Both systems depend upon inertia and the mechanical deflection of hair cells to initiate nerve impulses that are sent to the brain and interpreted as body movement.
weboflife.nasa.gov /learningResources/vestibularbrief.htm   (7998 words)

  
 VEDSA
Vertigo is a symptom of a problem in the vestibular system and is not a disease.
The vestibular system is located in the inner ear and within specific areas of the brain.
Disorders of the vestibular system are often difficult to diagnose.
www.vestibular.com.au   (326 words)

  
 Vestibular Neuritis
Vestibular neuritis has also been referred to in the literature as vestibular neuronitis, epidemic vertigo, acute labyrinthitis, vestibular paralysis, and vestibular neuropathy.
Basilar artery insufficiency is caused by occlusion of the vestibular branch of the internal auditory artery.
Collapse of vestibular membranous structures either primarily or as a component of another process such as endolymphatic hydrops is described as vestibular atelectasis.
www.bcm.edu /oto/grand/71494.html   (1175 words)

  
 Vestibular System - Acoustic Neuroma Patient Archive
All of the sensory input concerning balance, from the eyes, from the muscles and joints, and from the two sides of the vestibular system, is sent to a central area in the brain, called the brain stem, where it will be sorted out and integrated.
When you are healthy and both sides of your vestibular system are functioning properly, the two sides of the vestibular system send impulses to the brain that are symmetrical.
After a period of time, the brain "learns" that the input from this activity is "normal" for the damaged system, and the side effects of dizziness and balance decrease.
www.anarchive.org /vestibular_sys.htm   (1022 words)

  
 Vestibular Disease
In a nutshell, the vestibular apparatus is the neurological equipment responsible for perceiving one's body's orientation relative to the earth (determining if you are upside-down, standing up straight, falling etc.) and informing ones eyes and extremities how they should move accordingly.
When a case of vestibular disease presents, it may be a good idea to wait a few days to see if improvement occurs before doing diagnostics beyond a routine blood/urine database.
When an otoscope is used to visualize the external ear of an animal with vestibular disease and debris is seen, this would be a good hint that there is infection in the middle ear as well.
www.marvistavet.com /html/body_vestibular_disease.html   (992 words)

  
 issues
The vestibular system comprises the inner ear, including the semi-circular canals, otolith organs, sacules, etc., as well as projections to the ears, eyes, and cerebellum.
When the vestibular system is treated as a whole interactive system, it can be gently enhanced and frequently returned to normal or near normal function.
Where the systems are only functioning marginally, and other areas of the brain and central nervous system are already over-taxed in compensating for this major deficit, stress can cause profound effects.
www.handle.org /disordrs/issues.html   (1976 words)

  
 Vestibular System   (Site not responding. Last check: 2007-10-14)
It coordinates information from the vestibular organs in the inner ear, the eyes, muscles and joints, fingertips and palms of the hands, pressors on the soles of the feet, jaw, and gravity receptors on the skin and adjusts heart rate and blood pressure, muscle tone, limb position, immune responses, arousal and balance.
The vestibular and auditory nerves join in the auditory canal and become the eighth cranial nerve of the brain.
Offer, but do not force, these activities on a child as the vestibular system is constantly adapting and what works one day may be aversive on another.
www.braintraining.com /vestibular.htm   (772 words)

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