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42 Cards in this Set

  • Front
  • Back
What 3 major structures comprise the Labyrinth (inner ear)?
Cochlea, Vestibule, Semicircular canals
What two structures comprise the Vestibule of the inner ear?
Utricule, Saccule
The Bony Labyrinth contains _____ ( ___ rich) which is continuous with the ________ _____.
Perilymph; Na+; Cerebrospinal Fluid
The Membranous Labyrinth contains _____ ( ___ rich) and communicates with the ________ sac.
Endolymph; K+; Endolymphatic
What does the Endolymphatic sac do?
Absorb endolymph (continuously produced)
The vestibular system helps with maitenance of _____, _____ ____, and ____ position with respect to ____ motion.
Posture; Muscle tone; Eye; Head
What are the two subdivisions of the vestibular system?
Static Labyrinth, Kinetic Labyrinth
What is the Static Labyrinth composed of?
Utricule, Saccule
What detects static orientation of the head with respect to gravity?
Saccule
What are the 2 types of specialized hair cells in the Static Labyrinth?
Macula Utricle, Macula Succuli
The hair cells in the Maculae are embedded in a gelatinous mass, the _____ membrane which contains _____ crystals.
Otolithic; CaCO3
The Kinetic Labyrinth is composed of the _____ _____.
Semicircular Canals
What detects angular acceleration and deceleration?
Semicircular Canals
The Semicircular Canals are ______ oriented so they can detect all possible directions of motion.
Orthagonally
Where are the specialized hair cells in the Semicircular Canals located? What are they called?
in the Ampullae; Crista Ampullaris
The Crista Ampullaris hair cells are embedded in a gelatinous mass called ______.
Cupula
What occurs the same way it does in the auditory system since the endolymph is continuous between the two systems?
Transduction (how a signal becomes an action potential)
What causes hair cell depolarization?
Potassium (K+) influx
Hair cells have _____ on one end with a longer ______ on the opposite end.
Microvilli; Kinocilium
What happens when the microvilli bend toward the Kinocilium?
the cell will depolarize
What happens when the microvilli move away from the Kinocilium?
the cell will hyperpolarize
Hair cells (receptors) synapse with dendrites of bipolar cells called _____ ganglia or _____ ganglia; axons from which form the _____ nerve.
Vestibular; Scarpa's; Vestibular
Where does the vestibular nerve enter the brainstem?
at the Cerebellopontine angle lateral to the Facial nerve
The vestibular nuclei are in the lateral aspect of the _____ of the _____ and _____ parts of the fourth ventricle.
Floor; Medullary; Pontine
Axons from the vestibular nuclei project to:
Cerebellum (_____ lobe, _____ nucleus)
Spinal cord (_____ tract)
Brainstem (Nuclei of CN ___, ___, ___ bilaterally via the ___)
Thalamus (____ ____ nuclei) and on to
Cortex (____ ____ areas)
Flocculonodular; Fastigial
Vestibulospinal
III; IV; VI; Medial Longitudinal Fasciculus (MLF)
Ventral posterior
Parietal association
What does Internuclear Opthalmoplegia present with?
Inability to carry out synchronous horizontal gaze
What 3 cranial nerves may fail to carry out synchronous horizontal gaze, causing Internuclear Opthlamoplegia?
III (Oculomotor), IV (Trochlear), VI (Abducent)
Lesion of the _____ ________ _______ may cause failure of cranial nerves III, IV, and VI, resulting in Internuclear Opthalmoplegia.
Medial Longitudinal Fasciculus
What are the 2 vestibular system examinations?
Barany Chair, Caloric testing
In the Barany Chair vestibular exam, the patient is rotated ___X in ___ seconds while flexing forward ___ degrees, then rotation stops _____.
10; 20; 30; Abruptly
In the Barany Chair vestibular exam, an intact system will produce _____ (named for fast component) _____ that of the rotation.
Nystagmus; Opposite
In the Caloric test of the vestibular system, warm or cold water is put in the ______ ______ ______.
External acoustic meatus
In the Caloric test of an intact vestibular system, cold water produces nystagmus to the ______ side of irrigation--warm water to the _____ side.
Opposite; Same

(Cold Opposite Warm Same; COWS)
The Vestibulo-Ocular reflex prevents diversion of the ____ from a target when the ____ is moved.
Eyes; Head
What are the main symptoms of lesions to the vestibular system?
Vertigo, Nystagmus, Dysequilibrium
_____ lesions of the vestibular system may produce nystagmus in various directions in the _____ of vertigo during positional testing.
Central; Absence
_____ lesions of the vestibular system may produce horizontal nystagmus only in the _____ of vertigo during positional testing.
Peripheral; Presence
Meniѐre's disease presents with vestibular symptoms such as _____ loss, _____, and _____ accompany _____ loss of hearing and ____.
Equilibrium; Nystagmus; Vertigo; Progressive; Tinnitus

(Idiopathic)
The age of onset of Meniѐre's disease is ___ - ___ years of age.
20; 30

(Idiopathic)
Acoustic Neuroma is a relatively _____ _____ ____-growing _____ cell tumor of the vestibular nerve.
Common; Benign; Slow; Schwann

("Schwannoma")
Acoustic Neuroma is typically found in the region of the _____ _____ _____ or the ________ ____.
Internal acoustic meatus; Cerebellopontine angle
Acoustic Neuroma may also affect the ____ and ______ nerves.
Facial; Trigeminal