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Topic: Vestibular apparatus


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In the News (Sun 21 Jul 19)

  
  Vestibular apparatus - Health Encyclopedia
Stimulation of the hair cells in the vestibular apparatus is associated with the sense of hearing.
Stimulus of the vestibular apparatus is mediated largely through histamine and acetylcholine receptors.
Located within the inner ear, the vestibular apparatus is the sense organ that detects linear and angular accelerations of the head and relays this information to brainstem nuclei that elicit appropriate postural and ocular responses.
www.steadyhealth.com /encyclopedia/Vestibular_apparatus   (105 words)

  
 Chapter 9 - Vestibular Functions
The vestibular apparatus is the nonauditory portion of the inner ear.
The vestibular nuclei give rise both to the vestibulospinal tracts, which play a role in movement and posture, to be discussed in Chapter 16, and to connections with cranial nerve nuclei III, IV, and VI and motoneurons of the neck by way of the medial longitudinal fasciculus (MLF).
Disturbances of vestibular function include motion sickness, a failure to adapt to repeated movements; vertigo, a false sense of rotation due to irritation of vestibular nerve fibers; and short-term disturbances of equilibrium associated with destruction of one or both labyrinths.
www.unmc.edu /Physiology/Mann/mann9.html   (4959 words)

  
 CHAP VII
In the vestibular organs of birds and mammals, two types of hair cells are usually distinguished although they may in fact represent the extremes of a spectrum of morphological types.
The maculae and cristae are innervated by bipolar neurons of the vestibular ganglion.
The vestibular nuclei give rise to secondary vestibular fibers which project to specific portions of the cerebellum, certain motor cranial nerve nuclei and to all levels of the spinal cord.
www.neurophys.wisc.edu /h&b/textbook/chap-7.html   (1789 words)

  
 American Institute of Balance - www.dizzy.com
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.
Although Vestibular Rehabilitation has only recently gained world wide acceptance, the concept of head, body and coordinated eye exercises as a treatment for vestibular disorders is actually over 50 years old.
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.
www.dizzy.com /script/VestibularRehabilitation.asp   (1077 words)

  
  Palaeos Vertebrates: Bones: Ear: Overview (1)
The vestibular apparatus must have some method of equalizing pressure, or it would explode during changes in pressure.
For the bulk of the vestibular apparatus, that is approximately true, although the general orientation is maintained by loose ligamentous connections.
The perilymphatic duct runs along one side of the lagena for its entire length, from proximal (near the rest of the vestibular apparatus) to distal (away from the vestibule).
www.palaeos.com /Vertebrates/Bones/Ear/Overview.html   (2245 words)

  
  Vestibular Function & Anatomy
The vestibular system is made of five sensory organs on each side of the head embedded in the petrous portion of the temporal bone.
  The nuclei are the superior vestibular nucleus, the lateral vestibular nucleus, the medial vestibular nucleus, and the descending vestibular nucleus.
The functions of the vestibular system are to sense angular acceleration, linear acceleration and to coordinate head and eye movements as well as maintain the antigravity and lower body muscles in relation to the head.
www.utmb.edu /otoref/Grnds/Vestibular-2004-0414/Vestibular-2004-0414.htm   (1731 words)

  
 ICP monitors
The primary vestibular fibers from the cristae of the semicircular canals are distributed mainly to parts of the superior and medial nuclei; those from the utricle macula terminate in the ventral part of the lateral nucleus; the saccule macula terminate in the dorsolateral part of inferior vestibular nucleus.
From Cajal, fibers descend bilaterally in the MLF and terminate in the IIIrd, IVth and medial vestibular nuclei of the brainstem and in laminae VII and VIII of the spinal cord.
Axons from the nodulus and flocculus descend to terminate in the fastigial nucleus.
www.ucsf.edu /nreview/02.2-Anatomy-CranialNerves/CN08-vestib.html   (2103 words)

  
 lab6
The cells of the vestibular ganglion project into the central nervous system to interact with the vestibular nuclei of the medulla or directly to the vermis of the cerebellar cortex.
Vestibular ganglion - bipolar cells that relay vestibular sensation to the vestibular nuclei and the cerebellar cortex directly.
Vestibular nuclei - these lie in the floor of the fourth ventricle and either interact to help control eye muscles or receive input from the cerebellar cortex and project to the spinal cord to assist in balance and equilibrium.
hippocrates.ouhsc.edu /showcase/Neurosciences/lab6.html   (1698 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.
The vestibular apparatus allows us to walk, even run, on very uneven ground without falling, helps us know when we need to right ourselves, and allows our eyes to follow moving objects without becoming dizzy.
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)

  
 The Listening Centre - Listening Therapy is based on the published works of Professor Alfred Tomatis
The vestibular apparatus monitors the interaction between the body and the environment, whether static or dynamic.
Once the vestibular apparatus is well integrated, the cochlea is able to function in an optimum way.
It triggers an intense stimulation of the vestibular apparatus and helps the children to improve their balance and co-ordination, as well as their gross and fine motor skills.
www.listeningcentre.co.uk /dyspraxia.php   (504 words)

  
 American Institute of Balance - www.dizzy.com
Keeps images stable on the retina while head is moving, facilitated by vestibular ocular reflex; used when walking, keeps horizon stable during heel-strike, or reading lines of print.
Consisting of motion; forces acting on the body during movement and the interactions of sequence of motion with respect to time and forces present.
True vertigo is the sensation of moving around in space or of having objects move about the person and is a result of a disturbance of equilibratory apparatus.
www.dizzy.com /script/Glossary.asp   (418 words)

  
 Kneelsit - Balance and Movement relieve lower back pain
The awareness of posture, movement and changes in equilibrium derived from receptors of your muscles, joints, tendons and vestibular apparatus.
This links up with the natural balance mechanism of your inner ear (vestibular apparatus) through a series of receptors forming a continuous feedback loop - the "balance effect" - which activates and develops your sense of proprioception.
The gentle back and forth movement of your body which occurs naturally when using the kneel-sit stimulates the tiny cilia lining the tubes of your vestibular apparatus (balance mechanism of the inner ear) to help keep you alert.
www.kneelsit.com /balance-movement.html   (673 words)

  
 Sect. 8, Ch. 7: The Vestibular Apparatus   (Site not responding. Last check: )
The vestibular apparatus consists of bilateral, paired, mirror image arrangements of fluid-filled ducts and sacs, with patches of neuroepithelium at strategic points.
The receptor cells for vestibular function (hair cells) are located in patches of neuroepithelium in the ampulla of each semicircular canal, in the macula of each utricle, and in the macula of each saccule.
In general, the vestibular receptors of the two sides of the head work reciprocally, i.e., when one side is excited, the other is inhibited.
www.lib.mcg.edu /edu/eshuphysio/program/section8/8ch7/s8ch7_4.htm   (173 words)

  
  Science Fair Projects - Labyrinth (inner ear)
The labyrinth is a system of fluid passages in the inner ear, comprising the the vestibular system and the auditory system, which provides the sense of balance.
The vestibule is the region of the inner ear where the semicircular canals converge, close to the cochlea (the hearing organ).
The vestibular system works with the visual system to keep objects in focus when the head is moving.
www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Vestibular_apparatus   (330 words)

  
 Ask the tri doc: vertigo
Approximately the size of a pea, the vestibular apparatus is enormously complex given its diminutive stature.
A complex interplay of nerve signals from the vestibular apparatus, the eyes and special nerve fibers that detect body position allows the brain to coordinate muscle movements and perform feats of locomotion as basic as walking or as complex as aerial acrobatics.
In either case, the pathophysiology is the same: infection causes inflammation of some part of the vestibular apparatus resulting in a continuous stream of motion signals being erroneously sent to the brain.
www.triathletemag.com /Departments/Training/2005/story60af.htm   (1592 words)

  
 Vestibular 2001 UIUC-COM Neuroscience
The lateral vestibular nucleus is somatotopically arranged: outflow to the upper limbs is in the ventrorostral regions while outflow to the lower limbs is located in the dorsocaudal regions.
Decerebrate rigidity (lesion above the level of the vestibular nuclei and below the red nucleus) is due to loss of inhibitory cortical input which leads to unopposed excitation of motor neurons by the lateral vestibulospinal tract (and the pontine reticulospinal tract).
It is believed to be due to abnormal circulation of the vestibular endolymph, possibly due to increased endolymph volume, although similar symptoms have resulted from irritation of the proximal end of the VIIIth nerve root (similar to the etiology of trigeminal neuralgia).
www.med.uiuc.edu /m1/neurosci/WebNeuro2002/protected/curriculum/Unit_15_01_Vestibular_System/Vestibular.htm   (2821 words)

  
 New Page 0
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.
The vestibular apparatus allows us to walk, even run, on very uneven ground without falling, helps us know when we need to right ourselves, and allows our eyes to follow moving objects without becoming dizzy.
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.baringvet.net /vestibular.htm   (999 words)

  
 Exercise Your Wonder: January 1, 2005
The vestibular apparatus is housed in the ear and consists of two chambers called the utricle and the saccule, and the three semicircular canals, all of which contain endolymph.
Both the complex nature of the vestibular apparatus and the ability of the central nervous system to properly use this information to allow for mobility and survival need to be explained by evolutionary biologists.
And between the eyes, the vestibular apparatus, and the proprioceptors of the neck and spinal column, the brain becomes informed about where the head is sitting in its environment.
www.arn.org /docs/glicksman/eyw_050201.htm   (3896 words)

  
 Vestibular Disorders Association | Vertigo, Imbalance, Dizziness resources - Sensory Input
The ability to maintain balance depends on information that the brain receives from three different sources—the eyes, the muscles and joints, and the vestibular organs in the inner ears.
Each inner ear has a hearing (auditory) component—the cochlea, and a balance (vestibular) component—the vestibular apparatus, consisting of three semicircular canals and a utricle and saccule.
When the vestibular apparatus on both sides of the head are functioning properly, they send symmetrical impulses to the brain.
www.vestibular.org /vestibular-disorders/balance/sensory-input.php   (517 words)

  
 A dog with elephant-like skin
Although the hair cells function similarly in the cochlea and the vestibular apparatus, the biologic signals that are generated differ.
In the vestibular apparatus, the three semicircular canals detect angular acceleration of the head of the animal.
By contrast, the circulation of endolymph in the membranous labyrinth is not continuous between the cochlea and the vestibular apparatus.
www.dermapet.com /articles/art-22.html   (2657 words)

  
 Research Activities
Dr Newlands uses neurophysiological and neuroanatomical techniques and primate/rodent models to study the response of the vestibular apparatus to motion and surgically induced insults.
Her research has focused on vestibular afferents and her interests include structural-functional correlations of the vestibular nerve, physiological characteristics of subgroups of the nerve, and changes that occur during aging.
Adrian A. Perachio, Ph.D. conducts research centered on the neurophysiology of central and peripheral vestibular afferent and efferent pathways.
www.utmb.edu /oto/Research/Research-activities-2.htm   (513 words)

  
 Moving Ahead - ARS   (Site not responding. Last check: )
Because the vestibular system interacts with many other parts of the nervous system, symptoms may also be experienced as problems with vision, muscles, and thinking, and memory.
In addition, people with vestibular disorders may suffer headache and muscular aches in the neck and back, increased tendency to suffer from motion sickness, and increased sensitivity to noise and bright lights.
The Vestibular Disorders Association is dedicated to helping you find knowledgeable physicians, to distributing information about these disorders, and to providing videotapes, booklets, a quarterly newsletter, and other materials to enable you to cope with your symptoms.
www.alaska.net /~drussell/ars/ma6_2.html   (967 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
8th cranial nerve, from the peripheral vestibular sensors to vn, the vestibular nuclei in the brainstem.
Signals from the vestibular system also project to the Cerebellum (where they are used to keep the VOR working, a task usually referred to as Learning or Adaptation) and to different areas in the cortex.
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.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=vestibular_apparatus   (1337 words)

  
 Vestibular System Notes
Even though we are not usually aware of the sensations produced by the vestibular apparatus, the normal functioning of which is essential for motor coordination, eye movements and posture.
The major symptom of vestibular disease is vertigo (dizziness) that is accompanied by (except in its most mild forms) some degree of nausea, vomiting pallor, perspiration, and some difficulty of walking.
Vestibular sensation is carried by the vestibular portion of eighth nerve.
www2.umdnj.edu /~neuro/neuro03/schedule/vestibular.htm   (835 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.
The vestibular apparatus is a small sensory organ that resides in the bony labyrinth of each inner ear.
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)

  
 Vertigo: Online References For Health Concerns
The otolithic apparatus consists of tiny particles of calcium carbonate suspended in a gelatinous matrix in two structures called the utricle and the saccule.
It can also occur when the head is subjected to unfamiliar movements, such as the rolling motion associated with seasickness, spinning for an extended period, or when the head is held in an unusual position (such as when you tilt your head and neck back for an extended period).
Vertigo of the vestibular nerve—Diseases of the eighth (vestibular) cranial nerve cause vertigo of the vestibular nerve.
www.lef.org /protocols/prtcl-109.shtml   (2843 words)

  
 Cowell's Physiology of Galvanic Vestibular Stimulation   (Site not responding. Last check: )
2: The bony and membranous labyrinths of the vestibular apparatus.
The vestibular apparatus consists of a central volume, the vestibule, intersected by three circular canals oriented in orthogonal planes and two sack-like protuberances, called the utricle and saccule.
In the vestibular apparatus, nerves from these cells collect into the aptly-named vestibular nerve, and in the cochlea, into the auditory nerve, both of which are combine into the 8th cranial nerve and travel into the brainstem.
www.davidson.edu /personal/macowell   (1777 words)

  
 Deafblind International
Vestibular tests are made by recording vestibulo-ocular and vestibulo-spinal responses to vestibular stimulation (often with electrodes in contact with the the skin or with video-recording).
In children with a normal otolithic sensory apparatus but no semicircular canals, control of axial tonus develops normally, with no massive axial hypotonus, but independent walking is delayed as a result of rather frequent falls starting with the very first attempts to walk without support.
Spontaneous compensation for vestibular deficits with visual informations alone is thus very difficult for the infant because the visual system is still physiologically immature and gaze stabilization by the vestibulo-ocular responses is impaired.
www.deafblindinternational.org /standard/cause_conf12.html   (1326 words)

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