DPT 540 - VESTIBULAR SYSTEM EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
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Course
DPT 540
Institution
DPT 540
DPT 540 - VESTIBULAR SYSTEM EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
What are the 3 main jobs of the vestibular system?
Gaze stability, postural stability, perception of motion
Peripheral vestibular structures
Otolith organs, semicircular canals, vestibular nerv...
- each possess small patch of hair cells whose stereocilia/kinocilia are embedded in a
membrane containing small crystals
How are the maculae of utricle and saccule oriented?
Macula of utricle is horizontally oriented (same plane as base of skull), macula of
saccule is vertically oriented
What makes up kinetic labyrinth?
Semicircular canals
- 3 patches of hair cells (cristae) present in ampullae of each canal
Bony labyrinth
Consists of semicircular canals, cochlea and vestibule. Filled with perilymphatic fluid
Membranous labyrinth
, Contains membranous portions of semicircular canals and otolith organs. 1 end of each
SCC is widened to form ampulla, filled with endolymphatic fluid, surrounded by
perilymph fluid in bony labyrinth
Semicircular canals
Horizontal, anterior and posterior canals that are arranged 90º to each other. Detect
angular acceleration and velocity.
- 6 individual SCC become coplanar pairs (oriented in the same planes as pulling
direction of extraocular muscles that allow connections between sensory neurons and
motor neurons)
Sensory redundancy
If damage to 1 canal of the pair, the CNS can still get information from vestibular system
about head velocity within that plane from the contralateral member
Anatomy of semicircular canals
Membranous, fluid filled tubes. At one end of each SCC the tube enlarges to form the
ampulla. Epithelium within ampulla thickens to form ampullae crest, hair cells are
embedded within ampullae crest
Hair cells (SCC)
Each hair cell projects up in ampulla and has 40-70 fibers, kinocillium is the longest and
thickest of fibers. Fibers arranged from shortest to longest
- movement of fibers toward kinocillium is excitatory, movement away is inhibitory
Cupula
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