Vestibular Flashcards
What are the inner ear anatomical structures?
• Cochlea
• Labyrinth
• Vestibule – utricle & saccule
What are the anatomical structures of the middle ear?
• Ossicles: Malleus, Incus, Stapes
What are the anatomical structures of the outer ear
• Auricle/Pinna (external ear)
• Auditory canal – ends at tympanic
membrane
• Tympanic Membrane
• Boundarybetweenouter&middleear
Explain the labyrinth layers…
Outer = bony labyrinth
Filled wit perilymph
Inner= membranous labyrinth
Filled wit Endolymph
What are the 2 otolith organs in the membranous labyrinth?
Saccule n utricle
What’s layers inside semicircular canals?
Ampulla—> cupulla —> cilia
What happens when stereocilia cells are deflected TOWARDS Kinocilia?
Excitation or depolarization
What happens When stereocilia cells are deflected AWAY from the kinocilia?
Inhibition.
When you turn head to the right… explain what happens in each horizontal canal?
Right horizontal canal is excited, increased firing rate
Left horizontal is inhibited, decreased firijg
What orientation is the utricles axis?
Horizontal
What orientation is the saccules axis?
Vertical
What are otoconia?
In the maculae
• Calcium carbonate crystals within otolithic
membrane
• Sit on gelatinous layer
What are the 4 peripheral lesions for pathos?
• InnerEarPathology
• Vestibular Neuritis (UVH)
• Benign Paroxysmal Positional Vertigo
• Meniere’s Disease
• Unilateral or Bilateral Vestibular Hypofunction
What are the 4 central lesions for pathos?
HeadTrauma
• Meningitis
• Brainstem or Cerebellar Stroke • Multiple Sclerosis
What is Oscillopsia?
motion of objects in the environment that are known to be stationary
