Vestibular system of inner ear

Question 1

what does the vestibular system detect? (2)

Answer 1

movement + positioning

Question 2

what is the function of the vestibular system?

Answer 2

to maintain balance

Question 3

Parts of the Vestibular system (2)

Answer 3

3xsemi circular canals

Orolith organs

Question 4

what types of movement does the vestibular system detect (and by which parts)?

Answer 4

semi circular canals=angular

orolith organs= linear

Question 5

parts of semi-circular canals

Answer 5

each tube contains endolymph fluid

each canal has an ampula closest to the uricle

cristae are sensory receptors in ampula

Question 6

how do the semi circular canals detect angular movement?

Answer 6

1. Angular movement of the head causes movement of the endoplymph fluid within the semi-circular canals
2. the Cristae detect rotational movement of endolymph fluid in canals
3. Cristae initate nerve impulse
   * each of the semicircular canals are at different angles detecting different movement angles*

Question 7

what is the response to detection of angular movement

Answer 7

The brain recieves these signals and sends APs to cause movement of the head in the opposite direction to maintain balance

Question 8

there is ………………..in the movement of fluid within the semi-circular canals

Answer 8

a time lag/ slight delay in orientation of fluid to movement

Question 9

what are the Orolith organs? (2)

Answer 9

1. Saccule

2. Urticle

Question 10

what do the orolith organs contain

Answer 10

1. macule sensory receptors
2. sterocilla hairs which are embeded in the membranes of the orolith organs
3. orolith crystals

Question 11

how do the orolith organs detech linear movement

Answer 11

1. when stationary the orolith crystals do not move
2. during movement the orolith crystals move/slide due to gravitational forces
3. movement of orolith crystals causes movement of setrocilla hairs
4. movement ofsterocilla hairs stimulate macule sensory receptors
5. Macule senory receptors send signals to the brain about lateral movement