DPT 540- VESTIBULAR SYSTEM EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
peripheral sensors
vestibular nerve, otolith organs, semicircular canals
otolith organs
detect linear motion and head position relative to gravity
- apart of static laybrinth
semicircular canals
detect angular motion ( kinetic laybrinth)
- 3 patches of hair cells are present in the ampullae of each canal
- arranged in a horizontal, anterior and posterior direction
- the 6 individual canals become coplanar pairs and these plains are oriented in teh
same plans as the direction of the extraocular muscles which allows connections
between sensory neurons and motor output neurons
job of vestibular system
gaze stability, postural stability, perception of motion
hair cells
sensory cells of the vestibular system
utricle
the larger of two sacs within the membranous labyrinth of the vestibule in the inner ear
- detects horizontal motion
, saccule
the smaller of two sacs within the membranous labyrinth of the vestibule in the inner ear
- detects vertical motion
opposite
endolymph is displace in the ______ direction with respect to their ampullae during
angular head motion
- turn head left, endolymph moves right
increases
neural firing ______ in the side the head is turned towards
decreases
neural firing _____ in the opposite side the head is turned towards
sensory redundancy
if damage to one member of the SCC pair, the
CNS can still get info from the vestibular system about head velocity within that plane
from the contralateral member
ampullae
location of hair cells in the semicircular canal
kinocillium
Tallest and thickest sterocilium of the hair cell
excitatory
movement of hair cells fibers toward the kinocillium is ______
inhibitory
movement of the hair cell fibers away from kinocillium is _____
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
peripheral sensors
vestibular nerve, otolith organs, semicircular canals
otolith organs
detect linear motion and head position relative to gravity
- apart of static laybrinth
semicircular canals
detect angular motion ( kinetic laybrinth)
- 3 patches of hair cells are present in the ampullae of each canal
- arranged in a horizontal, anterior and posterior direction
- the 6 individual canals become coplanar pairs and these plains are oriented in teh
same plans as the direction of the extraocular muscles which allows connections
between sensory neurons and motor output neurons
job of vestibular system
gaze stability, postural stability, perception of motion
hair cells
sensory cells of the vestibular system
utricle
the larger of two sacs within the membranous labyrinth of the vestibule in the inner ear
- detects horizontal motion
, saccule
the smaller of two sacs within the membranous labyrinth of the vestibule in the inner ear
- detects vertical motion
opposite
endolymph is displace in the ______ direction with respect to their ampullae during
angular head motion
- turn head left, endolymph moves right
increases
neural firing ______ in the side the head is turned towards
decreases
neural firing _____ in the opposite side the head is turned towards
sensory redundancy
if damage to one member of the SCC pair, the
CNS can still get info from the vestibular system about head velocity within that plane
from the contralateral member
ampullae
location of hair cells in the semicircular canal
kinocillium
Tallest and thickest sterocilium of the hair cell
excitatory
movement of hair cells fibers toward the kinocillium is ______
inhibitory
movement of the hair cell fibers away from kinocillium is _____
