Test 2 - Lecture 8 (Vestibular System) Flashcards Preview

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Flashcards in Test 2 - Lecture 8 (Vestibular System) Deck (18)
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1

saccule and utricle report

static head position relative to the gravitational axis AND movements that cause linear acceleration and deceleration

2

hair cells are arranged into an approximately elliptical patch

the macula

3

stereocilia extend into a gelatinous sheet

the otolithic membrane

4

5 sensory organs in the internal ear

1 and 2 - utricle and saccule (otolith organs)
3 - horizontal semicircular canals
4 - anterior semicircular canals
5 - posterior semicircular canals

5

the tall edge of the stereocilia are oriented either towards or away from a central line

the striola

6

saccule

vertical plane: vertical linear acceleration (head up and down)

7

utricle

horizontal plane: horizontal linear acceleration (left and right roll)
- primary gravity center

8

______ movement of the head cause the endolymph to displace the cupula in the opposite direction, relative to the ____ of the head

rotation

9

each semicircular canal extends from the utricle to the

ampulla

10

thickened zone of epithelium (contain hair cells)

ampullary crista

11

at the ampulla the lumen of the canal is traversed by a gelatinous diaphragm, the

the cupula

12

three coplanar pairs in semicircular canal

- two horizontal canals
- anterior canal on the RIGHT and posterior canal on the LEFT
- posterior canal on the RIGHT and anterior canal on the LEFT

13

side head is turning to _______, head turning away from ______

depolarization, hyperpolarization

14

clockwise flow of the endolymph will displace the cupula causing

increased firing on the LEFT, decreased firing on the RIGHT

15

medial and superior nuclei

semicircular canals (afferent input)
- vestibulo-ocular reflexes
- coordination of eye and neck muscles

16

lateral nuclei

otolith organs (reports changes in head position)

17

inferior (descending) nuclei

otolith organs (primarily)
- coordination of balance and voluntary movements

18

leftward head rotation evokes _____ eye movement

rightward