Balance, posture and vestibular system Flashcards Preview

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Flashcards in Balance, posture and vestibular system Deck (19):
1

What are the otolith organs and where are they contained?

Utricle and saccule
In the vestibule

2

Vestibular nerve is comprised of? (3)

Utricular nerve
Saccular nerve
Ampullary nerve

3

what are the 6 degrees of freedom?

X,Y,Z
Roll, pitch, yaw

4

Translational motion and linear acceleration is detected by?

Utricle and saccule

5

Rotational motion and angular acceleration is detected by?

Semicircular canals

6

Maculae are made up of what 3 components?

Supporting cells
Hair cells
Otolithic membrane (CaCO3 crystals)

7

Hair cells are made of?

Single kinocilium and many stereocilia

8

Tilt of cilia to the left =?

Depolarisation/increased firing

9

Macula provides info about which 2 things?

Dynamic and static equilibrii

10

Macula in the utricle is (horizontal or vertical)?

Horizontal

11

Macula in the saccule is (horizontal or vertical)?

Vertical

12

Name the three semicircular canals

anterior
posterior
lateral

13

Main sensory structures of the SSCs are localised to what structure?

Ampulla

14

What is in the ampulla?

Cupula- gelatinous mass that the cilia of hair cells are embedded in

15

What is the effect of head rotation on the cupula?

Distorts it due to endolymph and activates the ampullary nerve. Depolarisation increases on one side and decreases on the other.

16

What direction does the cupula bend in relative to head rotation?

Opposite direction

17

What are the pairs arrangement of the SSCs on each side?

L+R lateral together
L anterior with R posterior and vice versa

18

Where does the sensory pathway go from the cupula?

Ampullary nerve --> Vestibular nerve --> CNVIII --> medial vestibular nucleus --> motor neurons of neck/trunk to orientate head and stabilise retinal image (vestibulo-ocular reflex)

19

Where do afferents from the utricle and saccule go?

Ampullary nerve --> Vestibular nerve --> CNVIII --> lateral vestibular nucleus--> cerebellum and limb motor neurons to maintain upright body posture