Vestibular System Flashcards
The utricle senses ________ acceleration information.
Horizontal
The Saccule senses _________ acceleration information.
Vertical
What is the thing that contains hair cells in the christa ampullae of the semicircular canals called?
Cupula
What is the medial vestibulospinal tract involved in?
- bilateral
- cervical spinal cord for neck movements
- coordinates head and eye movements to stabilize gaze
What is the lateral vestibulospinal tract involved in?
- Unilateral/ipsilateral
- goes to all levels of spinal cord for postural adjustments
What is the vestibulo-occular reflex modulated by?
-inhibitory efferents from cerebellar purkinje cells
What is the vestibulo-occular reflex modulated by?
-inhibitory efferents from cerebellar purkinje cells
When does abnormal nystagmus occur?
-with lesions to the peripheral vestibular system (head trauma or temporal bone fractures)
What is benign paroxysmal positional vertigo (BPPV) and what causes it?
- pt experiences sudden intense vertigo with certain head/body positions or movements
- caused by otoconia that break free from ultricle or saccule and become lodged in cupula
**80% cure by using epley maneuver
What is labyrinthitis?
- virus or bacteria infect vestibula labyrinth or CN 8
- sudden intense vertigo, nausea, and/or nystagmus that lasts for days or a week
What are the symptoms of Meniere’s disease?
- sudden intense vertigo lasting minutes to hours
- tinnitus
- sense of pressure/fullness in ear
What prescription drugs can cause ototoxicity (hearing loss, balance problems, nausea)
- aminoglycosides
- Cisplatin
What prescription drugs can cause ototoxicity (hearing loss, balance problems, nausea)
- aminoglycosides
- Cisplatin
What does it mean if a patient can hear tones, but is having trouble hearing words at the same threshold?
-problems more centrally, perhaps in cortex
What is one of the only things that causes a low frequency sensory-neural hearing loss?
Menier’s disease